MTN does not communicate!!

When I initially got the contract the first 4 months we will charged almost double the contract fees. After bringing this up 8t took about 3 months for them to sort this out!!! In the mean while waiting for credit to be passed on the account and requesting proof of this nothing came through! After about 6 months we finally got traction with this account and sorted out the billing and credit! During the sorting out of the contract I did not pay it seeing that I will start paying once the account is sorted out as this was not a fault on our side. Eventually I submitted a payment plan to get the arears sorted out to get the account paid up to date. Following 3 months paying the exstra cash with the normal installement I get a email from them saying that this account is handed over to vericred due to none payment. I asked mtn when this was handed over and no response!!! I contacted vericred and they said we have not paid mtn anything since April 2023.i told them what happened and can show payments for this contract since April 2023 until now - so where is my payments being allocated to if it's not shown on my account and WHY do I owe vericred R14 000??? This is seriously madness!!!