Poor service from MTN and issues with the Huawei P60 Pro

On 18 June I signed a contract to purchase a Huawei P60 Pro at an MTN store. I was given the phone immediately, however 3 days later, I returned to the MTN shop to return the phone because the Sim card was not activated and the phone has got software issues as there are apps that can't work on the phone. The satellite messeging system advertised on the P60 Pro phone by Huawei are not functional. The MTN shop refused to take the phone. The Huawei team have failed to resolve the software issue and MTN has refused to take back the phone and Huawei is not responding to the issues I have raised. To date the MTN contract account indicates that contract activation has failed in the system yet they don't want to accept their phone back and resolve the software issue.