Mr Vusi, who is the manager of Diamonds Ltd, goes to ADCA Bank, to process a credit application on behalf of the company. He completes and signs the credit application form. ADCA Bank verbally alerts him to the fact that by signing the application form he stands surety for the company and Mr Vusi agrees to stand surety for the company. Diamonds Ltd fails to repay the loan and the bank sues the company as debtor as well as Mr Vusi in his capacity as surety.

Citing case law comprehensively, discuss the validity of the suretyship agreement between the bank and Mr Vusi