Poor customer service

So for the past 7 months from 1st of April 2021 including October 2021 I have been paying R200 more for a package that I don't have or even didn't ask for. Apparently open served did an upgrade on their lines end of March 2021 where to Vox upgrade our lines. On my side and open serve side my line stayed the same. I have phoned in, sent emails and complaint on Facebook but still Noone wants to get back to me. I have been told from 2 different people that my request for refund of R1400 is responsible. I even had to down grade on my own side even though everything on my side already says that I have a 10mbps line and not. A 20mbps as being billed for. They not even going to call me after the post. They are just going to past the buck around and hope that I forget.