Micromax Informatics — exchange the mobile

I have submitted my micromax q-426 at your service center datta enterprises 44/a gandhi nagar, jammu on[protected]
And i recived my phone on[protected] but the problem is still there. Then again i submitted my phone on 14/12/2017 in the same service centre and they ensured me that you will get your phone in proper condition. But i got my phone heated from the one corner so i refused to get it back and claimed for the new phone. So kindly exchange my phone and provide me a new one

Note :- i sent 7 times mail on this mail id but date nobody reply on my mail
My new jobshee no is n[protected]
Which was closed but still my mobile is not in proper condition