Contract issue

So I received a call on 2022/10/21 proposing an upgrade on my contract which I accepted, the package that I was promised is completely wrong. I have made numerous attempts to get this sorted and MTN has been telling me they can't as it was done by the external sales. One of the consultants told me to go complain on HELLOPETER as they can't do anything about it. The interesting part is that my account has been debited by MTN and not the so called thrid party. I've been taken from Pilar to post, I was told this morning by MTN that the upgrade was done by "PROVANTAGE" and gave me this number ***,the admin manager Lee-Ann Van Wyk told me the only she can help is by me sending her an emailnor call MTN directly. I called 135 again and spoke to Phindile who now said the upgrade was done by CELL NETWORK and gave me this number to *** which rings and gets rejected. I need assistance with this issue to be resolved. The sad thing is that when these people call they say they're calling from MTN and have one's profile.