MTN stole my money & will not pay it back!

On 1 December 2017 MTN **********ly debited R900 from my account for a contract I did not enter into. I immediately logged a ***** query with MTN. MTN took until February 2018 to sort out the query. R1800 was debited from my account. I stopped any further debit orders with my bank. I have phoned MTN many times to have my money paid back to me and I am told I am in credit. No I cannot be in credit because I have no contract for that. I want my money paid back to me. Every time I call I speak to rude call center people who cannot tell me anything further that they are going to lodge a further query. No one ever calls me back! I follow up and am told they cannot do anything but lodge a further query. How ridiculous is this? Is this the quality of your service? It is now almost the end of March 2018 and I have not received my money back or an apology from MTN for the incredible inconvenience caused. This is tantamount to theft! All I want is to received payment of the money ********ly taken from my account (by MTN's own admission) and to sever all ties with MTN, most shocking service provider!