Contract not being cancelled even after calling them multiple times for a home fiber

I took a contract with mtn in December and I called them due to network issues that I was experiencing and was told to take a router to the mtn store off which I did and because the contract was out of cooling period I was told that there is going to be an early termination fee off which I paid and was told to call mtn for the contract to be cancelled and I called the whole February and I was given stories instead of MTN cancelling my contract and only to be told that the cancellation had been done but it will take a month for the contract to be cancelled and please tell me how is that possible with a big reputable company but because mtn is a bunch of ****mers who do not do any cancellations even if their product is faulty and now they deducted money on my account. The last time I called them they told to go to the store whereas the store did their part and provided me with a reference number to give to them. I curse the day I joined this company and I would never recommend it to anyone because even the customer service doesn’t anything or it’s like they were told in training to not do any cancellations. It doesn’t matter if the service is used or not