Feedback on Faulty Device

I am Utterly Disgusted with the service that I have received from MTN to date. <br> I have not yet had any feedback from the MTN complaints department regarding REQ***. It feels terrible being ignored and yet they still debit my account each month without fail. I have logged various complaints via Twitter and Facebook as well and still nothing. so what do I have to do because MTN says that the device I am in possession of is not an MTN device so where did I get the device and why are they still debiting my account? MTN's service is atrocious and totally unacceptable! HELP<br> What do i need to do in order to get a response from MTN. The problem has been going on Since October 2015 and nothing yet. <br>