CTM RCS REFUSING TO CLOSE MY ACCOUNT

I called RCS CTM call centre because I wanted to pay off my account and close it. I spoke to Yolanda and ask for a settlement amount and I told her it is not what I expected and so she must please check herself or double check, in the process I told her about the debit order I reversed and I reversed it because I had paid the account manually just few days before the debit order went through. I told her to take what I am telling her into account and she again assured me that the settlement amount is correct. I then called them later because I wanted to tell them to close the account and they then tell me about the debit order I reversed and how I cannot close the account because there is still a balance. I called and told them to please listen to the call and get back to me, they always hang up on me. Ntombi nkosi told me her manager will listen to the call and get back to me and that was on the 07/02/2018. They haven't called me and they always hang up on me. I spoke to Amire on the 21/02/2018 and he asked for a bank statement because he wanted to see if I did pay on the 01/02/2018, I sent the statement and he also promised to call me back and he didn't. I called on the 23/02/2018 and Amir put me on hold and hung up on me. I need them to listen to the call because I will not pay that account, the reason I ask for a settlement amount is because I didn't wanna deal with that account anymore. I am really frustrated because they not even willing to help or come with the solution.