Hello expert tutors

John recently opened a savings account with a local bank, Smart Bankers Ltd. As part of the process of opening the account, Smart Bankers Led asked John to sign some contractual documents. Although he did sign, John is dissatisfied with the documents' lack of express details on the duties which Smart Bankers Led owes him as a customer. John now seeks your opinion on whether Smart Bankers Led owes him any duties under Zambian law, besides those contained in the contractual documents that he signed. Advise John