MTN *****ing people’s money

I got a cellphone contract for my iPhone XR with Mtn in December and app**** for insurance. But I’ve been billed incorrectly since January. I would call their customer care line, send emails almost everyday and go as for a complaining and asking for assistance on Twitter by tweeting and sending them DM’s but none of this was helpful. My ticket has now been closed unresolved with a comment saying we do not have access to your contract whereas the past few weeks the were saying “we are aware of that you’re being billed incorrectly, our finance team is looking into this matter”. My credit score is going to be ruined because MTN takes wayyyyy more than what we agreed on. We are on a lockdown, I need money to stock up groceries I obviously reversed it. But I just hate suffering for the incompetence for an organization now as a customer I must suffer for their error, and I’ve beeeen chasing this issue to be resolved and escalated.