Terrible customer service

I was contacted by a sales agent last year and was offered a R169 data deal and she was working from home and her kid was screaming so bad. I tried to listen the best I could and she convinced me that the deal was R169 pm. when I get my bill, it was R308+/-. I contacted MTN for days, on their call center number and I did not get through to them. eventually I emailed them to cancel my contract. they responded via email asking for more information which I provided. since then NO ONE has called me. then I find out that I have been handed over to collections lawyers. it is almost a year now that I tried to contact MTN and they could have called me to resolve the issue, but their customer service is so pathetic that they just handed me over. I never used the sim since I emailed them to cancel.