I bought a new phone in Sept 2021 and the beginning of Feb 2022, the phone started freezing even when you're listening to the radio it will switch itself off

I bought a new phone in Sept 2021 and the beginning of Feb 2022, the phone started freezing even when you're listening to the radio it will switch itself off. Programmes will freeze without opening. Then on the 19th Feb I took the phone back to Westgate Mall_ Total Sports. The manager said it will take 7-14 days and they will call me back. I went back on the 21st March to check my phone another new manager said oh! I only took it last week for repairs that other manager has left. Up until today I haven't heard anything from them.