Xiaomi India — service center technical team support

Address:

Mumbai City, Maharashtra, 400059

Hello i am writing about service quality of mi customer care executive and service center technician. I have submitted the phone to one service center in borivali - mumbai for touch pad not working issue. After phone observation one of lady technician informed that need to put some solution in touch pad so it will start working and you have to pay rs. 100+tax. After some time she come to me and explained that phone is out of warranty due to liquid damage, i[censored] want to repair please pay rs.7000.00 [ this is more than new phone cost] because mother board of phone faulty.
My question is my phone was working while submitting for repair then how motherboard went faulty? There were lot of exchange happened but they are hiding the truth, even there way of communication is also worst.
I want to speak to some one who will help me in this case and help to repair mobile. I have purchased this just 3 months before. If mi team is helping then i will have to take help of rti. My complaint no #[protected]