Samsung A53 5G

I purchased a A53 Samsung 5G cell phone in Cape Town Telkom store 8th April 2022. I had it 3months and it started giving me endless problems. Software, camera didn't work properly, doesn't screenshot, apps an issue to get into if you tap on the phone it switches off. It's been to Samsung in Johannesburg 3 times and they keep saying it's been repaired. But as soon as i get it back I can see nothing has been done. I'm now in Potchefstroom in the North West so I take it to the Telkom store at Mooirivier Mall. I've made enquiries and this handset is a factory fault. I would like my phone to be replaced ASAP. I've made numerous calls to Samsung in Johannesburg but response or a call back as to solve this problem. I'm paying R400 a month for a handset that's been in for repair more than I've been able to use it. I've got 2 A12 Samsung a A32 and A70 which has not given any problems. So can you help me solve my problem please.