Horrible service with MTN, they give client information to third parties without consent.

I've been on contract with MTN for more than 19 years, and in that time really had horrible service most of the time. I have made more than 20 calls to them in the past three months to resolve what looks like a very simple issue with no luck. I was shocked to realize that MTN shares client information with third party :) first of all is this allowed under the POPI Act? Problem is now MTN is having so much fun debiting my account when they should not be, because I still have not done an upgrade that they charging me for that was "done" by a third party. i am exhausted of sitting on the call with the agents that dont seem to understand the importance of customer service. I spoke to one of their employees yesterday and was surprised that he is the one that actually advised me to send a query to HelloPeter, I would like for someone at MTN to resolve this query so that i can finally leave them. I am enough of their bad service.