Rewardco and MTN

In November 2021 Rewardsco phoned me for a Mecur Guru Tablet. When I switched it on it didn't worked. I took it to MTN in Tygervalley to sent it away. As I still paying for it. In March I went back to MTN Tygervalley and the unit was still there. I told them to cancel my contract on the Mecer Guru cause I can't pay for something I don't have or even used. Since I cancelled that contract, my MTN contracts are a problem no more Debit order I do an EFT every month and still my service get suspended due to the fact that Rewardco and MTN didn't credit my account for the cancelation. I don't even have the unit in my position so how can I be reliable to pay for something I don't have. I have the tracking number of the courier that picked it up from MTN Tygervalley after a big scene due the fact it was there for 3 months before sending it away. Several e-mails and phone calls was made to Rewardco regarding the issue. They keep on telling me they did sent a e-mail to MTN and MTN needs to credit my account. How far must I still go to get this sorted out as I was generous every time, but getting your phone suspended every single month even if you pay the bill? I really hope this problem will be resolved after going to Hello Peter for help. I person can only to so much asking to resolve the problem from both the parties.