The appellants stood surety to the respondent (Absa Bank) for the debt of a partnership, D B Boerdery, in terms of various written guarantees. During 1995, there were negotiations between the parties regarding D B Boerdery's alleged outstanding debt and the appellants' suretyship. During these negotiations, the appellants, represented by their attorney, indicated they would be prepared to give an undertaking not to raise prescription as a defence. On 20 November 1995, the appellants signed a written undertaking to this effect, which was drafted by the respondent. The undertaking was unconditional and irrevocable, with no time limit. Settlement negotiations failed and in July 1996, the respondent issued summons against the appellants as sureties. The appellants raised a special plea of prescription, claiming that any debit balance on the account became due in November 1991, and that the debt had been extinguished by prescription under the Prescription Act 68 of 1969 before the undertaking was signed.