Overcharging account

Game is overcharging me and they said I didn't ask for settlement amount and I did that. I went to town (PTA) to pay that settlement in May 27th. So they decided to keep on charging me I think 30 something rands per month. Then August I paid them something like R80 for that overdue amount and send them email on the 7 Oct to close my account. I waited for reply and nobody reply to that email. So today 12-11-2015 I spoke to a lady called LINDSAY, she's got an attitude because I asked her to check that email on the 7th Oct immediately she told me that I didn't send that email then she started to become inpatient for me. I decided to end up our conversation. I just want them to close this account they said they won't unless I pay R115. I didn't take anything since May but I keep on paying my account and the settlement is being paid in full.