Terrible service

I have received my contract phone on the 17.07.2018 I tried to call the MTN call centre yesterday but I’ve been holding numerous times for 15-30 minutes at a time , when I call there useless call centre on 135 and explain that no one is answering the contracts department to just activate my damn SIM card I get to to hold they have high call volumes , what is the damn point of them having a customer care if that department cannot assist And this is a damn existing contract When you take up a contract or upgrade they fall to mention this but quick to sell the damn phones Could A consultant contact me back or I will be forced to return the phone and cancel my contract and move my business to another network that will value me , because I’ve been with mtn for 7 years and never received this service before !!!