Poor service , terrible customer service

I need to change my device which is faulty and the bluff store does not want to assist me. I had taken an upgrade on the 31-12-2020 to the Note 20, since day one I have been experiencing overheating and battery drainage. I went back to the store and mentioned this on the 3rd day of my contract and I also stated I want to get another device of another brand as I don't feel this device is safe as when my child was watching a video, he started to cry as it got too hot. I previously had a Samsung and had the same issues. It was more in the Nandi drive repair center than with me. I told them I cannot have the same issues and I am in fear that the device might catch on fire being the extreme case scenario. The consultant did not want to assist in that matter and had referred me to her managers email address, I expressed my concerns to the manager via email and only got a reply saying she's unable to change the device as I signed a contract. I am still within my 7 day period and asked that they take back the faulty device and cancel if they are unable to give me another brand device. I am stressed and concerned for my well being as well as my child. I cannot believe there is nothing telkom can do to assist a loyal customer of many years with multiple contracts with them.