DISGUSTING POOR CUSTOMER SERVICE

I am very disappointed in the servicce that I have received from MTN after being their loyal customer for over 30 years. The problem started with a contract that I took in 2011 and along the way I cancelled it. Unfortunately around 2019 this contract came back to haunt me. They claimed that I owed them a certain amount which I paid and decided that okay i will just continue and use it. I then decided that it did not make sense for me to have this contract and I cancelled it again. I tried for a sometime everytime this thing wouldn't close. I called, walked into their stores. I was even sent to go to 14th avenue their head office where I never got any assistance. I then escalated the matter their complaints dept they came back and said matter is resolved but i continued to get threatening sms's . Guess what I have learnt the other day that they actually blaclisted me with the credit beaures . Nobody is responding to my emails and my life is standing still for a stupid R159.