HISENSE - Faulty TV after 5 months. Horrible Client Service

My Dad bought the Hisense 65"Smart Television in June 2018. 5 months later he started having problems with the TV. He phoned the technicians who sent him to the store he bought the TV from to fill in the form, they then sent him back home and said that the process is quicker if he spoke to Hisense directly. This was not the case. The query was submitted to one of the technicians on Friday morning. The technicians promised to phone back that same day. He didn't. When we phoned Hisense the next Tuesday, the lady that took the call said that my Dad should wait and that they will get back to him. She had a massively rude attitude. After letting her understand that the service is unacceptable, she offered to phone the technician and follow up. She put my dad on hold and then cut off the line. We phoned again, spoke to a different lady who also tried phoning the technician. She advised that the technician isn't answering. Long story short, no one has phoned us back, the TV still isn't fixed and it doesn't seem like anyone at Hisense wants to help us. We will NEVER support them again.