MTN month-to-month *******/cancellation nightmare

I signed up for MTN month-to-month last year November, and I paid upon signing up. Few days after they delivered the router, they told me I didn't pay. I then logged a request with to investigate where my money is since they say they can't allocate it. I then received an email from that they found it and when I asked for a refund they then tell they "can't find my payment" I need to submit proof of payment and call the to ask for a certain number. My bank told me the money is still pending I should request authorization letter so they can release the funds to me. When I requested that letter they suddenly "found my payment" of which it was strange. I then told them I no longer require their services I want that money back. I sent the router to MTN store and got the ref number they wanted. Now they are refusing to refund that money since I paid for a service that was not rendered. My advice would be try other service providers. MTN will **** you and refuse to refund you, plus the cancellation process is a nightmare and the customer service is poor.