RCS wont close my account

I have an RCS card and recently got a Game account card which is also supp**** by RCS. I called RCS so I can settle the RCS card and keep the Game account in Feb 2018. First lady at call centre says its possible to transfer the outstanding amount to the Game account and I must wait for a call to terminate the account. Nobody calls back so I call again and another rude call centre agent says I have to pay the outstanding amount in cash because they dont nett off accounts. I ask how much and she gives me amount which I paid in and requested that account be closed. They are now refusing to close the account because it has a balance. it keeps accumulating monthly fees since Feb. They want me too pay this money and my question is how is the account accumulating fees if I requested that the account be closed. Last week a lady called and apologised and said she will ask accounts to clear this account. Im getting an sms today saying im liable for an even bigger amount.