Slip Knot Investments 777 (Pty) Ltd v Willem Malan Du Toit

Slip Knot Investments 777 (Pty) Ltd (appellant) advanced R6 million to the Smitskop Trust. The respondent, Willem Malan Du Toit, a sixty-year-old farmer, was one of three trustees of the trust along with his brother and nephew, though he had no beneficial interest in the trust and was not involved in its business. On 6 November 2007, the respondent was urgently requested by his nephew (through a friend, Altro Potgieter) to sign a bundle of approximately 75 pages of documents relating to business transactions in Africa. The respondent, who was busy farming at the time, signed all the documents without reading them at a bank in Luckhoff before a commissioner of oaths, assuming they only concerned his role as trustee and that he was not personally affected. Among the documents was a deed of suretyship binding him personally for the R6 million loan. The trust defaulted on a settlement agreement, and judgment was obtained against the trust and the sureties. The respondent's brother's estate and the trust were sequestrated. The respondent, unaware of the proceedings, successfully applied for rescission of the judgment against him. In the main application before the Free State High Court, Kruger J dismissed Slip Knot's claim against the respondent on the basis that his mistake was reasonable (iustus error). Slip Knot appealed to the Supreme Court of Appeal.

• Whether the respondent's mistake in signing the suretyship without reading it constituted a iustus error (reasonable mistake) that negated contractual liability
• Whether fraud or misrepresentation by a third party (the respondent's brother and nephew) in failing to inform him of the nature of the suretyship affected the binding force of the contract
• Whether the appellant was entitled to rely on the respondent's signature as evidencing his intention to be bound as surety
• The application of the doctrine of quasi mutual assent in cases of unilateral mistake

The appeal was upheld with costs. The judgment of the Free State High Court was set aside and replaced with an order granting judgment in favour of Slip Knot Investments 777 (Pty) Ltd against the respondent (fifth respondent) jointly and severally with the other respondents for: (a) payment of R7,950,000; (b) interest at the rate of 1.5% per week calculated daily from 8 May 2008 to date of payment; and (c) costs on the attorney and own client scale.

The binding legal principles established are: (1) Where a party signs a contract under a unilateral mistake not induced by the other contracting party, the decisive test is whether the mistaken party led the other party, as a reasonable person, to believe that his declared intention represented his actual intention. (2) Fraud or misrepresentation by a third party (who is not a party to the contract and whose conduct cannot be attributed to the contracting party) does not affect the binding force of the contract. (3) A contracting party is entitled to rely on the signature of the other party as evidencing an intention to be bound, absent any misrepresentation by the first party or knowledge (actual or constructive as a reasonable person) of the other party's mistake. (4) The scope for a defense of unilateral mistake is very narrow where the other party has made no misrepresentation and did not appreciate at the time that the offer was being accepted under a misapprehension - at minimum, the mistake must be reasonable (iustus) and properly pleaded. (5) The caveat subscriptor principle applies: parties who sign documents are generally bound by them, and the failure to read a document before signing does not, without more, constitute a reasonable mistake that negates contractual liability.

The court made the following non-binding observations: (1) A contracting party must inform the other party of terms that could not reasonably have been expected in the contract, but this duty did not arise on the facts as even a cursory glance at the bundle would have alerted the respondent to the suretyship. (2) The fact that a party is a farmer rather than a businessman is of no consequence where that party serves as a trustee and manages his own trusts - such a person should know what a trust is and the duties and responsibilities of a trustee. (3) There was nothing objectionable in the manner in which the documents were presented - the suretyship was not 'hidden' in the bundle, and its heading was sufficiently prominent. (4) The court noted that the interest rate charged was not placed in issue either in the court below or on appeal, implicitly suggesting that had it been raised, it might have warranted consideration.

This case is significant in South African contract law for its clarification of the doctrine of iustus error (reasonable mistake) in the context of suretyship agreements. It establishes important principles regarding: (1) the narrow scope for a defense of unilateral mistake where the other party has made no misrepresentation and did not know of the mistake; (2) that fraud or misrepresentation by a third party (not a party to the contract) does not affect the binding force of a contract; (3) the application of the caveat subscriptor principle - parties are generally bound by documents they sign, even if they have not read them; (4) that a contracting party is generally not obliged to inform the other party of the terms of a proposed agreement, except where there are terms that could not reasonably be expected; and (5) that trustees are expected to understand their duties and responsibilities. The case reinforces that contractual liability arises not only from actual consensus but also through the doctrine of quasi mutual assent, where one party's conduct leads the other, as a reasonable person, to believe in the existence of agreement.