OnePlus India — My OnePlus tv was suddenly stopped

My tv was suddenly stopped working its not turning on. So i raised rhe ticket the agent was cancelled the ticket 2 times and not informed anything and 3rd time the agent came and told motherboard issue and again cancelled the ticket and i called the customer service why the agent not came again to repair they told they cancelled the ticket and asked why .? They given the service number and told to contact to them and they sent same agent and we have to take tv to repair for service centre and told back light was gone it will be 10k cost and 6months warranty. We told ok. I called customer service they are telling the we won't provide the service number this not our mistake.Now they are not giving the bill for the amount and warranty also. Then we give explanation for me because they are cheating me