MTN non-exitent legal department

I am struggling to get through the MTN legal department. Netither are they responding to my emails nor answering calls. I have been calling and sending emails for the past three weeks. I settled an account that was handed over to them. They have not updated my credit status. I currently can't qualify for residential accommodation. It's so frustrating. I presume this is deliberate because the lady that answered the call this morning after 10 mins on the line, was laughing with her colleague when she picked up the call, and then she pretended as though she can't hear me. She kept on saying "MTN good day" countless times until I hang up the call.

Back story, the account that I had was canceled because of incorrect billing. I got this contract via Mondo. I was quoted via a call, but the contract did not have the billing amount. Mondo's ***** department confirmed that the lady quoted an incorrect fee.