The appellant, a supplier of office furniture, granted a credit facility to FMMC Holdings (Pty) Ltd to enable it to establish a showroom. The respondent, as sole director and shareholder of FMMC, signed a deed of suretyship binding himself as surety and co-principal debtor for FMMC’s obligations. After FMMC accumulated a substantial debit balance and failed to pay, the appellant sued the respondent based on the suretyship. The respondent alleged that the suretyship had been amended to limit his liability to the value of the initial showroom stock and that this amended document was binding. The appellant denied any such amendment and relied on the original suretyship, which required written consent by the creditor for any alteration.