MTN stole from me

From the end of 2018, MTN double debited my account for about 6 months. I logged a query which they acknowledged and despite promising to pay me back, I haven’t received my money. I even asked for them to at least credit my account since I am a customer but nothing has been done. I have tweeted, emailed, called, you name it, they just won’t pay me back my money. I went on to contact their legal department who escalated the issue to some individuals and the instructions to resolve my query have fallen on deaf ears. I am done with MTN as a service provider. All I want is my money back and am off to another service provider.