Most pathetic service from MTN

I had a data contract with MTN for 2 years. After the 2 years I cancelled the contract. MTN did not cancel the contract and were still charging me for a whole year. I complained about it and they addmitted it was their fault and that they would reimburse me for the money they owed me. I phoned so many times and was transferred from one person to the next at the call centre. No managers were ever available to assist. Finally Neo Nkwane from the Retentions dept contacted me and advisedthat I would recive my refund in 30 days. When 30 days was finished and I still didnt receive my refund I phoned Neo again. She said she would find out what happend and contact me. Till today she still hasnt contacted me. I have phoned and left hundreds of messages for her and emailed her several times and still she hasnt contacted me back. I will never renew my contract with MTN again. My cell phone no is ***