MTN *****ing my money since January 2016 when contract ended

I ended my contract and has been contacting MTN since December 2015. They are still debiting my account. I placed them on Hellopeter 18 April and they rep**** on the 19th that I will be refunded and guaranteed me that they will not debit my account again. today they debited again. I am sick and tired of these ******* *****ing from hard working people and getting away with it. I lost more than R1000 worth of airtime when they converted my number to prepaid and more than R600 was debited after I ended the contract. It is 3 weeks and I am still waiting for MTN ******* to refund my money. Below is there reply of the 19th of April 2016 Official business reply: Hello Lezarn Ford, Thank you for your post. We are sorry to have disappointed you with our service and would like to assure you that we do strive to provide the best service at all times. The matter has been escalated to the relevant supervisory team for urgent resolution. They will contact you directly with feedback and an action plan. We understand that the entire experience must be very frustrating and hope that we can restore your faith in us. warm regards mike REQ:*** Restore my faith lol you must be joking. I will make sure that everyone I know never take their business to MTN. I WANT MY MONEY!!!!!!!!!!