Paid off account

I have paid off my edgars account in November 2014 if I'm not mistaken. Today I get an sms telling me that I need to make payment to my account. I called head office, I was told that I did not pay off the account and that I had a balance of R90.00, I was then charged R37 monthly and now I have a balance of R403.00. Could someone tell me why was I not informed that there was a balance on the account. I did not even receive a statement, which the lady on the line conveniently changed it to be sent to my e-mail. When I paid off the account, I specificly asked the attendant for the full balance and paid.I need someone to sort this out as I am not going to pay for your incompetence. You can even close the account as I don't trust you any longer.