Amazon India — I am not able to return the phone

Address:	600094
Website:	amazon.co.in/returns

I ordered honor6x phone. I had over heating issues and phone was very slow even though I was using airtel 4G. Amazon provided me with a replacement but having same issues with the new one as well. When I contacted customer support they asked me to download smartchk app, but the page is not loading for me. Customer support is of no assistance in this regard. They are not providing a proper response. I want a refund as I am not satisfied with the phone's performance.