Telkom refusing to swop or cancel my contract

On the 7th May 2022 I purchased a Telkom contract phone (Honor 50), on the 5th August I traveled to kzn when my phone suddenly had no network on both Sim cards. I called telkom customer service which I struggled to get through but after attempts to get this sorted over the phone it wasn't resolved and I was advised to go to the nearest telkom. I returned to Jhb the Monday and immediately went to the store where I purchased the device, the guy in store tried to assist and the phone seemed fine, I went home then that evening the phone had no network again. I returned to the store on the 9th where the guy called the SSS cellular and they advised me to bring the phone to them. I drove 40min to Boksburg on the 18th Aug when I arrived one of the technicians checked the phone and confirmed it was faulty but they can't take it in because the manager isn't in, I further told them that I no longer want this phone and would prefer to swop with a brand I am fami**** with and was advised to go back to the store. I drove back to Alberton city where I was informed that the best they can do is take the phone in for repairs. I mean, I barely had this phone for 3 months and it's giving me issues, I still have 20 months left of this contract. Telkom needs to either swop this device for another one or cancel my contract so I can get something better! One doesn't even get this much drama when returning clothing of poor quality after having warn it for over 3 months but I get this much drama for such a poor but expensive device. The only way I am able to use this phone is by using 1 Sim card which means that I pay for minutes and data that I am unable to use!!!