Amazon India — My mobile return delayed

Respected sir, I j.srinivas ordered iqooZ7s 5g phone in Amazon.After i received my phone, i observed that phone is heating issue and more radiation issue then I raised a complaint in Amazon.They send technician to my home and he checked my phone and, he said that phone has problem and he promised me to return my phone, then I shared satisfactory pin with him.since then I don't receive any phone or message to return my phone.I contacted Amazon customer care and explained about whole issue but they are helpless.So you are requested to do needful to me.

Regards,
J.srinivas,
Mob: [protected].