Poor Service Delivery from Hisense Management

A 65" Hisense TV was bought. It is still under warranty.

The USB ports stop working. I have been trying to chat to a manager at Hisense. I made two calls today and non of the managers called back. Manager Nathan from Hisense and assistant ***nor. Non took the time to call me back. It's been 4 months now that I am trying to sort this issue out. My question is when something is under warranty and stops working, is this not covered? When the item was purchased, we are told you have a certain amount of years warranty. Is this not correct?

The poor service delivery from Hisense is shocking.

Noresh Ramdhani