Unwilling to help

I have called in three times into the call center April and I asked for my settlement amount for the full account. I did settle this amount and I phoned in again into the accounts department they assured me that my entire account has been cancelled on the phone. In May I received a bill stating my account was not cancelled. I was willing enough to pay off my account. Every month I call in every month I get cut off and every month I spend R200 worth of airtime and I just frustrated. Yesterday I receive I email stating they are putting me on a black list. I phone in furious as can be. They said I never paid my account in the last four months. I had to print all my payments take into the nearest branch stating I have paid my account which was suppose to be cancelled. I cursed so much yesterday and this not my nature. Today I receive a email stating they are unwilling to assist because they dont have any proof from me that I cancelled and that I must please settle my amount. If they have recorded every phone call why cant they go back there is the proof of how many times I have asked this. I am not going on a bad credit score because of Edgars unwilling to assist me the way it was supposed to be 4 months ago