Bad service

I recently bought A new Samsung S22 few days later I realise that Battry life was not lasting even half a day. I took it back to them they refused to replace the phone claining that I was a day late I should have bought the phone within 7days. I my opinion it was still withing the 7days but their argument was the day you leave the shop its day 1... So they said they will repair the phone but the phone come back to me aferr a week and all they did was system upgrade on the phone not change the Battery so I still experience the Same problems again... I then took it back to them the second time around and they now put a claim under my insurance without my consent and they are saying the battery life is affected by scratches on my phone... Which I don't agree with the because the phone was having battery life problems from day one.. I am experiencing a very bad service with Telkom I am paying for the pho e that I don't even have with me