Lack of service

I trying to bite on my teeth but there aren't any left to bite on. In the last 12 months I had the worst service from the worst service provided ever to provide a service! For the last 12 months 60% of the time I wanted to use my 3G/Wi-Fi, I found that I had no internet connection and still I received a bill for R3 100.00 last month. And it is not phone calls or sms's as I accumulated over 250 min call time and 200 sms's . 2 Months ago I received a call to verify my postal address for MTN to send me a new LTE sim card, I am still waiting for it. So on the 16th of May I went to the MTN shop in IRENE Mall Centurion for assistance just to be told that I can do the LTE swap at the store but will cost R180 or I will have to wait until MTN deliver the new sim and I was left hanging. I want to swap service providers as MTN's over all services are as short as their name. Trying to buy internet bundles through MTN's much bragged service via web or phone came out to unsuccessful event. I eventually managed to use loyalty points to by more bundles!