Unhappy customer

I'm very angry with MTN service, firstly I signed up for route and sale person ask me to pay up first so that I can receive the router. The sale person say I will it within 5 days, Dsv called me to I explained them to deliver the next. I tried to follow up with them the was rude lady answer my call . I got angry I drop the phone and I called MTN to Cancel on the second week until today waiting for my money. All I want is money back because they service is poor