Phone not working

Is it fair to buy a phone and not be able to use it?

On February 2021 I bought a Hisense phone at Mr Price Clearwater Mall. Hardly 2 days the phone started switching itself off and back on again . I went back to Mr Price on the 3rd day and the lady that assisted me said it needed a system update , she updated it and rebooted and I was told it would not give me problems.

Unfortunately the problem persisted and I took it back again. I was told that they could not exchange or replace my phone with another 1 as it was now the 8th day , but it should go in for repairs at the MTN repair center in Sandton.I honestly believe that they purposely didn't want to exchange my phone and pushed the 7 day mark , they could have just replaced my phone on the 3rd day. The phone has since been in for repairs at the MTN repair center for 2 consecutive times but the same problem still persist.

I called Mr Price 1 week ago to complain about the same issue asking that my phone be replaced or my money back and I was told they would get back to me. I'm really disappointed with the service as my patience has been really tested.

Mr Price , Hisense and MTN may I please please please get assisted , I truly regret giving Hisense a chance as brand and believe Mr Price should stick to selling clothes .

Tell me is it fair to buy a phone and not be able to use it?