MTN REPAIR CENTER UNHELPFULLY

I had my new CAT S61 CS61-SAB-ROW-EN BLACK SILVER (***) for about two weeks and the battery went from 70% to 23% in a matter of minutes. I send the phone in for repair. That was July 2020. I am 70 kilomoters from Kimberley MTN Diamond Pavilion mall. I have been there 3 times and they do not have answers for me and frankly it looks like don't want to help me. I phoned the repair center and they said the phone will be send back to MTN in Kimberley not fixed because it can not be a warranty claim. How is that even possible if I only had it for two weeks. To date I have not received a phone call from MTN explaining the situation to me. The reference I got from the customer care center is ***. This is unacceptable. I pay my contract on time.