Flipkart — Customer care, refund,replacement and product overheating issue

Address:	600044
Website:	Flipkart

I had ordered a Lenovo Vibe K5 plus. I contacted the customer service regarding overheating issues. They asked me to install smartchk app. The first time the check was done the temperature was found to be 35°. I called again later when the phone felt very hot. I begged again for a check it was found to be 41.7°. they told that they will send a technical personnel to my home on 20th. But I will leave for college, for which they asked me to leave the phone at home. How ridiculous is that!? Now I checked the phone temperature with the help of an app. It is found to be 53°. But, I wonder what will be suffice to convince them of the problem. I want to avail return and replacement. Can someone please make sure it is done?