Refuse to close my rcs card

I have been struggling to close my rcs account since the beginning of september. Ive requested a settlement letter from rcs so that I can settle my account. I paid the full amount and requested that rcs close my account. Rcs asked me to call back the 13 of september as rcs can only close the account by that date. I called back the 13th and was told their is an amount that is owed to me. The call centre agent advised that the cash would me paid to me in 2 weeks time. I called 2 weeks later as the money was never paid to me. I spoke to another consultant that advised that I need to email documents in order for the refund to be paid. I emailed and weeks went by and still nothing. I called Rcs once again to find out what happens to the refund. The call centre agent then advised that there is nothing owed to me but I have to pay an outstanding amount of R700! I asked how is this possible if I paid the settlement amount months back. The agent then checked though my statement and told me 2 online purchases I've made 4 months back duplicated. He then advised that I email the 2 invoices with an explanation of what happened. I did exactly that and nothing came of it. One whole month went by and I received an sms from RCS stating that I owe them R232. I called yesterday highly ****ed and asked what happened after I emailed, absolutely nothing! The call centre promised to call me back and of cause as I've assumed he never did. I will advise everyone to have no dealings with this company. They are so ***********! who do I need to deal with that will assist me efficiently?!