TV not working... Still wait for call from Hisens technician

I bought a 55 inch TV in January 2019. The TV was just fine until April during lock down, the tv just went blank and no sound or picture from the TV. I called their service center and told me they have logged a call but can only assist after the lock down. When were in level 4 lock down called and they said I should respond to the same email I got the reference, so a technician can come and fix and I did that...

But still no one called from Hisens. I have been calling them and every time they tell me one a technician will call me.. It's been a week and not respond from them.

I am at home with 2 kids and no TV during lockdown.. I am so frustrated and WILL NEVER BUY ANYTHING FROM THEM AND IT WAS THE FIRST TIME AND LAST.

WORST SERVICE......