Bad accounting resulting in legal action on y name

I had contracts with MTN and when CellC had the "buy out" promotion I went over to CellC. The money was paid to MTN for the buy out amount but was never allocated to my account. After numerous calls I spoke to Patience Moloko who eventually assisted me. But that was not the end. There was a small amount outstanding on the contracts and again the struggle began to get a statement from them to show how and why. The account was handed over to VVM attorneys, saying I owed MTN R12000.00!!!, and I explained to them what had happened. (This was done before the funds was allocated by MTN). They said they will follow up and get back to me. Never happened. The next moment I received a sms from MBD attorneys for the same matter. Again I explained the situation to a lady by the name of Vicky. She said they will follow up and get back to me within 2 weeks. STILL WAITING 6 MONTHS LATER. Again I contacted them and got the same result. Eventually I went to MTN to try and resolve the matter or get some more info. Eventually I did get a statement from a lady by the name of Pozana and it showed that I only owe R1973.72. Where does the R12000.00 come from????? I made payments to the value of R2000.00 to settle the account and requested a letter confirming this. Now it is a struggle between MBD (whom I cannot get hold of at all!!) and MTN (who tells me that the matter is with MBD and they cannot do anything about it) to get this resolved. I have send e-mails with requests and proof of payments regarding this to Patience and Pozana but have not even received a reply. I have tried to contact the MTN legal department to no avail, and the same with MBD (numbers (4) I have just rings). I now have contacted the Ombudsman but have not received any reply from them either. I have a legal matter over my head due to incompetence on MTN's side and cannot resolve the issue due to me not being able to contact MBD (they only send sms and the number on the sms never gets answered by a consultant). And this is all due to incompetence and REALY BAD CUSTOMER SERVICE FROM MTN AND MBD.