Horrible Service from MTN

I have a contract with MTN, I have had countless bad experiences with them due to the services I have been give. Last year I encounter issues where I would struggle to get them to debit from my account which will result in me having to pay them via eft. I reached out and was told if they don't debit it's my responsibility to make am eft payment. I then changed my bank from FNB to STB and I request to change my account details after numerous calls they finally sent me a mandate which I approved in October and from there things went downhill again.They did not debit on the date agreed upon and I would have to make payment, On 1 December 2024 they debited my account even though my debit date is the 20th of each month and said the payment did not go through I then made a payment via eft. On the 20th January 2025 was the first time they actually debited on the correct date. Today I received a email that my credit score has gone down by 11 points due to a missed payment. I contacted mtn customer service and spoke to a team leader named Akona who advised that I need to speak to someone in the credit department. He than transferred me to the collections department where I was advised that I am not on file as I am not owing anything.i was further transferred to the billing department where I was told they cannot assist as I have no missed payments and I had to speak to someone in the credit department. I was then sent from pillar to post with multiple agents hanging up on me or told me to call credit bureaucracy directly until I finally spoke to someone who said she would log a call for further assistance and it would take 24 hours to resolve. An our later I receive and email saying my query has been resolved successfully and the feedback is that it was a system issue. No feedback on how they will update my credit report or an applogy for updating my information incorrectly. I have had this contract for almost 3 years and I have never missed a payment. I am disgusted by the horrible services I have received and if I do not get assistance I do plan on escaltinf this further