**** service at the store

MTN trade route has given me the worst possible experience as a customer. I visited the store on the 18th December to do an upgrade on one of my contracts. The cell phone I up graded to was the Samsung s21 when I received the phone I was really not happy with spec of the phone and returned to the mtn store to cancel the upgrade and return the phone the store assist said I should call the retention team to find out how much I would pay to return the device they advised that because it was with in the 10 days of purchasing that I would not pay anything. They advised the branch should take the device and follow the process. To me it seems that the branch don't know what the process is and I'm now currently sitting with a cellphone I don't want and will be paying for this device for the next 2years. MTN said that if only I purchased the device online I would have had the right to cancel but because I made the purchase in store I can not return the device My contact number is ***