Xiaomi India — mi tv 4a pro 32inch

Address:	5th Street, 629251
Website:	www.mi.com/in/mi-led-smart-tv-4a-32/faq

I purchased mi tv on mi.com. I received the tv on 24/11/y2018. When I tried to use the feature mirror screen it's not working. They are advertising it as a feature in their website (https://www.mi.com/in/mi-led-smart-tv-4a-32/faq/).i registered a complaint about the issue to mi customer care. They sent a service engineer to rectify the problem he could not solve the problem. so i request for replacement/return but he said it's not in their policy.
I asked Xiomi customer care about the issue, they are saying sorry to me, they said they can't do anything.I attached the pictures below they are clearly advertising the mirror screen feature in their website but they failed to give that.
They just said we took it as a feedback.I was hopeless by their reply.
How can they advertise the wrong information on their website.It's an offence .Please try to solve my problem.Thank you Sir/Madam.