Game Stores On January 19, 2025, I bought a 95-inch Skyworth TV from Game Brits branch, I bought "CASH" Within 3 months, the picture quality deteriorated - sometimes displaying black lines in the middle of the screen

Game Stores On January 19, 2025, I bought a 95-inch Skyworth TV from Game Brits branch, I bought "CASH" Within 3 months, the picture quality deteriorated - sometimes displaying black lines in the middle of the screen. We reported this to Game and they promised to send a technician. It took 5 weeks for the technician to arrive (June 12, 2025), and since then, we've had NO UPDATE. On June 21, store manager Michael assured us he'd resolve the issue by the following Monday, but still NO RESPONSE. I've contacted Game customer service THREE TIMES - each promising a solution within 24-48 hours, BUT NOTHING HAS HAPPENED. I demand either a replacement TV or a full refund. Please help me resolve this issue.