Home Loan Life Insurance Policy -Bad Service

We obtained a home Loan from Standard Bank and opted to get our OWN Life Insurance, which we had to proof to Standaard Bank- we did. We signed NO Life Insurance forms with this bank. 3 months later, we saw that our home loan deduction is too high. After 12 phone calls, we were told, it's the life insurance! Which we NEVER SIGNED FOR! WE have to cancel the Life Insurance at a completly differant departmant. Lots more phone calls. I just phoned ( 3 differant tel no) to enquire if they received all the e-mails - After I gave my id no, adres ext , they can't help me because the address I gave (the same as the post their letters to me) is not the same???? It's 1 year later and they are still deducting money off our account, WITHOUT any signed documents. How can this Bank get away with this?