Endless Spamming

I've been a loyal MTN contract customer for 8 years and my wife for 6 years. I'm am 1 damn phone call away from never using MTN again.

I've gotten 4 calls saying I can upgrade, I've upgraded 3 weeks ago... I've gotten 3 calls about insurance on my new phone. Not sure about how many times the wife got those but she has also nearly lost her mind. HOW MANY TIMES SHOULD I ASK YOU TO STOP CALLING ME? You will be losing me and my wife's contracts come next contract expiry if I get one single more phone call from MTN that does not involve some major issue on my account.