Samsung - Complaint regarding Galaxy tablet FE not resolved yet one half Month has passed

I had bought samsung galaxy tablet S* FE worth Rs. **,*** on June ****.After using it for * month ,the device started to bend gradually due to heating issues. when i raised complaint and asked for replacement company is denying for the same though it is under one year warranty. Company denying by saying it is costumer misuse rather manufacturing defect .After a month company came up with resolution offering **% discount on repairing cost And total reparing cost is **,*** Rs. As a middle class customer i simply can't bear a single penny of the repiaring cost. Either I want my device to replaced or repaired by free of cost .Otherwise i want refund of purchasing amount. As I have been in touch with your authorities since last one month, I am not getting positive resolution from VOC head Vandana Arora Mam and the team.
I am attaching all the mail copies that I have sent to your authourities from day one. I want replacement of my device or refund of purchasing amount within * days .Otherwise I am going to file a case against the company under Consumer Protection Act for cheating the customer as well as for mental harassment that I had to suffer since last one month.

Above notice i have sent them by DTDC post from pune to Gurgaon head office of samsung india but My parcel has came back.
I am trying to contact the concerning authority ,but they are not replying .