Just to follow-up, the technicians put down the issue to my TV which is ridiculous since I have a Samsung The Frame, which is a fairly mainstream and costly model. It is even more ridicuous as I an older 4K Fire is much smoother than the abonimation Tata Play is selling.
Their resolution to the issue is that they will fix the compatibility sometime in the future, when the hardware itself is evidently significantly underpowered and till that time I am supposed to just keep paying them for the horrible experience.
In short, don't invest in the Tata Play box if you can because it has got extremely poor hardware, made worse by even worse software. It is topped up by the incompetence of their technical team and customer support.
After a lot of complaints and the pending NCH compaint, the CEO Desk from Tata Play contacted me and offered cancellation as an option.
They deactivated my account the same day and took back the box the next day.
2 days later, they informed me that they will deduct 2499 from my remaining balance because I am terminating my connection before 6 months, even though they offered me cancellation as a solution after saying that they cannot rectify the issue with the box.
It has been 9 days now since my connection was deactivated and now they are not responding at all over any of the channels, so I am not even sure if and when I will get a refund.
Just don't trust this company. It seems they are either incompetent or unethical.