On 26 August 2003, the respondent lent Z$4 billion to the second appellant to acquire controlling interest in Trans Zimbabwe Industries Ltd (TZI). The shares were held as security and the first appellant signed as surety. When the appellants could not pay on the maturity date, the debt was rolled over to 29 February 2004. When payment was still not made, the debt increased to over Z$32 billion. After negotiations between the parties through the respondent's curator, the parties agreed to reduce the amount to Z$18 billion. On 2 March 2004, the second appellant signed an acknowledgement of debt for Z$18,382,120,596.74, and on 16 March 2004 the first appellant signed a personal guarantee. The appellants admitted liability for the capital debt of Z$4 billion and interest up to the double (Z$8 billion total), but contested the balance of Z$10,382,120,596.74 as illegal interest exceeding the in duplum rule.