Worse experience with MTN

I am very upset at how MTN has treated me after being such a loyal customer for so many years. My contract was upgraded by their rewards third party company and as per their policy, I decided to cancel the upgrade within the stipulated time frame because I felt the upgrade was not suitable or what I wanted. It’s been two months since I logged the cancellation and it still has not been done. I have called several times to follow up on the cancellation and to get a firm date for the cancellation, as I was told that the cancellation would take 30 days and that 30 day has long passed but still I have no luck. They telling am a Merenda who I logged the cancellation with is working tirelessly to help me but I don’t see that, as I have not even received an SMS to confirm that a cancellation is in progress. I am still being debited for a contract I do not want. This has been frustrating as I have been receiving no help from MTN or their third party company Rewardsco. This company called me to offer me an upgrade on behalf of MTN, so the issues between the company and MTN, how they work with cancellation should not be my problem as a customer. It took them minutes to upgrade me, now it has been two months to cancel something I don’t want. This actually want to leave MTN as a network provider completely. This not a way to treat a customer at all and not fair that I have to keep paying for something I don’t want.