Worst service ever - I will never recommend MTN!!

MTN sent me an LTE sim card (currently I get 3G in my area if I am lucky-but that's another complaint entirely). I followed the instructions to perform the sim swap. Once my old sim got inactive, I swapped to my new sim and waited for the welcome SMS I was supposed to receive. So I waited and waited. My phone just says No service and its been more than 12 hours of waiting. So I tried calling the MTN call centre on *** (not from my phone since I cant use it). I called them at least 5 times today. Each time I enter my cellphone number and the correct option to speak to an agent. After some music and some adverts, my call just gets disconnected. This happened at least FIVE times today. So I have no service on my sim card for a whole night and day. My old sim card does not work anymore either. And MTN keeps disconnecting my call. I cant wait to get to the end of my contract, because I will NEVER renew with MTN or recommend them to anyone either. So annoyed with MTN!!