Default and cancelation of MTN contract that led to account handover.

This communication serves as a formal complaint and unsatisfactory customer service of MTN. Let me briefly state my concerns and complaint, I was a MTN customer, I took out a cell phone and Wi-Fi router contract in the year 2021 and ensure monthly repayment. Then, I took out an additional LTE Wi-Fi package, the year 2022 (March 2022) which result in my above-mentioned complain and unsatisfactory service from MTN. The LTE Home route Wi-Fi package unfortunately gave me a lot of connectivity and internet coverage problems, which result in me contacting customer service and coverage department in March 2022. The coverage department intervened and ran several connectivity checks, which resulted to contract cancellation due to coverage not being compatible for my specific location as per coverage report issued. The coverage department requested me to return the device (router with SIM) to the Tygervalley MTN store where I took out the contract, for a cancelation application. I contacted the salesperson In March telephonically and via WhatsApp (still have the WhatsApp chats as proof), informing him about my situation. I return the device and ever since I'm still waiting for the contract to be cancelled, I'm billed monthly for a service I'm not using, and worse both my two existing contracts are also affected because now I’m paying for a service I'm not using. Now my service is cut, and the contract is severely in arrears, cause my name to by in default on my credit profile. The salesman keeps on saying he was await a IRMS number and the system is not responding. Now my account is blocked can't use my phone, the device was taken back to the store, and MTN handed me over to MBD collectors. Now my credit record is damage, and I have to repay MBD monthly for a service a never used and have no access to the device. It’s almost two years now, I even handed MTN and the store over to my private lawyer, but they refused to respond on the emails communications sent. I’m really unhappy with MTN bad customer service that cause me so many problems!