Failure to provide necessary information

I took a loan of R2500.00 in Jan or Feb 2013, and African bank have been debiting R300 from my bank account each and every month, but it seems as if I'm not paying as three months back I discovered that I still owe them +-R3000. I called them today to get the balance of the money I still owe because I want to pay them the full amount, as I don't want any relationship with them anymore, but Mr Bhengu failed to assist me because he asked me three security questions, I gave him my ID numbers and my cellphone number but couldn't get help because I told him the address I was using when I took a loan from them was not my permanent place of residence as I was renting a room and that I no longer stay there and as a result I have forgotten the address, but still refused to help. I feel like African bank is ripping me off and they do not want to give me the information I requested because they do not want me to settle the debt with them so that they will be able to continue ripping me off my money.