Xiaomi India — Mobile become heat and continuously shows out of reach

Address:

New Delhi, Delhi, 110025

I have purchase my xiomi read me2 from your web side but phone shows very poor performance and become heat and shows out of reach most of the time .
I have lost most of important call due to out of reach issue and it is continue after talk to your toll free number and follows their instructions too.

Now I want an upgrade phone or remove this problem asap.