Bad and unprofessional service

We bought a Sinotec 39 Inch HD LED TV on 25/10/2019. Warranty on this TV is 5 years. On 08/03/2022 we took the TV in for repairs. The TV have sound but no picture. According to repair agreement Game were supposed to have the TV fixed after 21 working days. They phoned us 21 working days and said that the backlight is faulty and will fix the TV and get back to us. Six days after that I phoned and still the TV was not fixed. A lady called Michelle working at game said she don't get the right story regarding the TV. Today my wife phoned again to enquire about a credit note to buy a new TV. Michelle again said she was going to get back to her. After 3 hours I phoned then a Red Alert security answered the phone. When I explained the reason for my call and asked her name she dropped the phone. I am very unhappy about this bad service