Bad service

I upgraded the 31 Dec 2021 but did not use the phone as I did not have a front screen.I started using the phone two weeks before this incident happen.i still took the phone to Vodacom as I could not open whatsapp and the consultant assisted me and I had to pay for the assistance. took my phone on 7 April 2022 to Vodacom as the phone was getting hot,goes into options even if I don't touch the phone and the phone used 5gig in 4 days.I received sms and went to fetch the phone 19 April 2022.The consultant switched the phone on but the battery was flat and he said I need to charge the phone and see if it working properly.I did so when I got home and it did the same .I called the repair centre and asked why all my info was wiped and also that I experienced the same problems and what is it that was done on the phone as they have not indicated anything on the job sheet .The consultant said that they have reloaded a new operating service onto the phone and I had to take it back to the store.This is really very bad customer service