Activation Centre gives terribe terrible service

Got my upgrade on Tuesday, since then I've been calling the Activation Centre and I'm no further than when the delivered the upgrade last week Tuesday 5 December? Apparently a problem with the new sim card they delivered with the phone. You can call as often as you like, some of the staff don't even make notes on their system, I've had the phone put down on my twice today 11 December, after my 6th attempt I got through to MTN. No one has done anything about my sim card? MTN is quick to give you an upgrade but their aftercare services sucks, big time. I will not recommend MTN to anyone and wherever I go and at every opportunity given I will tell everyone about the bad experience I've had the misfortune of dealing with. Word of mouth advertising is BIG!