Pathetic service after receiving a poor quality good.

Purchased a JVC 55'' TV is September 2018 which has now frozen and wont go past the start up screen. Called in more then 3 weeks ago to log a return, they said they would have a technician call me back. They tried calling which i missed the call. I then called back gave them 3 alternative numbers to reach me on. No call back. I call in again only to be told nothing has happened since the first point of contact as I needed to provide them with a serial number in order to log the return in the first place. Pathetic service.