Refund run around from March 2020 to date

I recieved a router from Rewarsco.com and there was no sim card inside the package, I then decided to cancel the contract and when I called I was told to return the router to an MTN store closet to me. The MTN store took the router and I recieved a 'goods recieved note' with a collection number on March 12th 2020. I called Rewardsco.com to inform them that I had returned the router and they promised to log a call to MTN so they don't deduct money from my account for the router contract. I have been calling them from March 2020 after my first deduction, I was told they haven't received the router yet that is why they deducted money. I have been following up from the 28th May (spoke to consultant Amanda) 4th June (Spoke to Niakhan) and I was told she escalated my issue to MTN 19th June ( spoke to Amanda) she told me she would ensure MTN stops crediting my *** July (spoke to Niakhan) I was told my issue will yet again be escalated, there was a delay due to a positive COVID-19 case at the warehouse 22nd July - I called and there was no response 7th August (spoke to Miranda) I was told it shows on the system that the contract was cancelled 18th September (spoke to Noxolo) I demanded to speak to the manager but she was in a meeting, however Noxolo said she would escalate my matter and I would receive an SMS in 48 hours and still nothing October and November I did not call them On the 1st of December (spoke to Noxolo) Noxolo put me through to the manager, Trisha Naidoo who told me that there was nothing on the system about a cancellation and she promised to get back to me before 5pm on the same day, she never did. Till today I try following up and I can't get through.