I need my refund back, poor service

Mtn has been giving me problems from day 1, I regret the day I got into business with them, customer service is bad the call center agents are the worse of all. It's either day dont know what they doing or saying or they being trained to say whatever just to get you off the line, the hold time over 20-30 min. I had requested for a refund till this day no1 has got back to me nor have I received my money, again I logged a query that my connection was cut before pay day and I was advised that is due to none payment, but how would it have been due to none payment if it wasnt my pay day was, so what about the money I paid for the full service while it was cut 4days prior to payday, how did they even conclude to none payment 4 days prior I need that money for those days to be refunded as well because I paid for those days, the data is "uncapped" however during the month I would get "I've used up my fair usage" then I know there goes my connection it buffers forever it dont work. I need my money that I paid for the month