Samsung A51 - Repaired I think not.

We purchased a New Samsung A51 on contract from Telkom Wonderboom Junction. A month ago the fone started to freeze at random and shutdown, sometimes being frozen and unable to restart, sometimes just by trying to unlock the phone or when trying to answer a call, note there was no apps open on the phone at this time, at other times it will get very hot and when you are using an app it will shut down or freeze, we then wipe the phone by doing a factory restest, and still, it froze and shut down sometimes 5 to 7 times. We then took the fone back to Telkom and by luck, the fone did the same thing while there. They sent away the phone to Samsung to repair, Samsung reinstalled the software of the phone and we received it back 2 weeks later. We started the phone, downloaded and installed the Capitec app and boom shame thing the phone froze and would not even shutdown, we immediately went back to Telkom and show them that the phone is frozen yet again. The Technician at Telkom then did a hard restart and the phone worked again. After trying to explain that it is not normal and that it is still not repaired the Technician blatantly did not want to believe us and made it out to be our inability to work with the phone saying that we open too many apps and that it's us that is using the phone incorrectly. Keep in mind we only had one app open when the phone froze again. After getting fed up trying to explain to the Technician that the phone is not working correctly and needs to be looked at again we left. Since then the phone is still freezing and shutting down at random doing the same things as mention above. 2.11.2020 Phone froze and shutdown used the Gmail app 3.11.2020 Phone froze and shutdown, used zoom, during a call, had to do a hard restart 4.11.2020 Phone froze and shutdown used Facebook 5.11.2020 Phone froze and shutdown, while trying to unlock, got fed up did a factory reset. 6.11.2020 Phone froze and shutdown used Spotify 7.11.2020 Phone froze and shutdown used the Gmail, Facebook 8.11.2020 Phone froze and shutdown used the Spotify 9.11.2020 Phone froze and shutdown was trying to answer a call 10.11.2020 Phone froze and shutdown, trying to unlock the phone 11.11.2020 Phone restarted during charging, decided not to use the phone. 12.11.2020 Phone froze and shutdown used Gmail 13.11.2020 Phone froze and shutdown while unlocking. So now I have to just deal with this and still pay my contract but my phone is so horrible and useless. And the Technician at Telkom will not listen to me when I go back yet again because their attitude is I am the one at fault here not my phone this is damaged and needs to be fixed.