A new laptop is not working

I bought a smart TV and a laptop on the 6th December 2021 i only used it twice during December because of our busy festive schedule on the first week of January i notice that the laptop it isn't charging anymore i took it back to the shop which they booked it for repairs and returned three days later but the following week it started to switch itself off while I was using it, u took it back for repairs. It was booked and after a week they phoned me to collect it, after about three days it started to be slow and lagging and the mouse cursor had disappeared on the screen. This time i was angry and had enough i took it back to the shop and told them that i didn't want it anymore and want a refund or a new laptop because i was supposed to start on a new program in January but now I'm a month late that was on the 28th January 2022. I spoke with technicians Jerry and Tshabalala, I told them that i want a refund or a new laptop but they said that the manager is not around but they'll let him know when he's around i told them that it's not enough which they said they'll contact the area manager but he's on leave at the moment. They'll give me feed back, since then they haven't contact me or anything. I want a refund or a new laptop because i sold a lie of a device.