Hisense TV under warrantee

I purchased a TV in January 2020. The remote control started giving issues and a line across the TV appeared, I contacted Hisense in December 2020 to report this. They sent technicians out to see the TV and I was told it was faulty and the TV would be replaced. This is where the struggle starts... a massive struggle just to get in contact with someone after logging complaints, trying to call, leaving messages at head office etc etc. I have been in contact with a Cindy who keeps telling me it will take 5-7 working days we are now 4 months down the line and I am sitting with a TV that is no longer working. This is absolutely shocking service for a TV that was not even a year old!! I have always used the Hisense brand but I really find the after service for a big company like this disgusting. All I ask is that they keep me up to date with what is happening!! I am now being ignored after sending four emails to follow up on their promise of 5-7 working days!!! I have asked numerous times for her to put me in contact with someone who CAN help me but this is also ignored. Their contact number on website is also not working. What am I supposed to do??