Poor call center service

The telephone lines are very bad.... from last week I have been calling RCS to close my account before they inject in extra amounts because my account is still open. I paid off the amount I was given to pay and advised to call again after paying. I did that but the phones are not being answered. Now my account is no longer R0.00 because of RCS not answering my calls. I even went to the store, still the calls were not answered. RCS please rectify my balance and close my edgars account.