Xiaomi India — switches are not working in redmi y1

Address:

Chennai, Tamil Nadu, 600040

I bought a Redmi y1 online in mi store which is not working perfectly, the down keys are not working so I want to change a new phone for free by taking this phone back it would be nice if you send any person to exchange it would be nice or solve the buttons and replace it freely and the phone's heating very oftenly so we are requesting you to solve the problem or please get the phone back again and give our money or give a new phone.