HTC India — Mobile given to service center and yet not returned back even after 1.5 month

i bought HTC Desire 826 Dual Sim mobile, with IMEI nos [protected] on the very next day of buying, the touch of the phone goes faulty, on this i have given my phone to HTC service center. i didn't received any satisfactory replay from the service center till 1 month, than i mailed the details to company email, on which they called me and asked the time span of 7 days. again after 7 days i didn't received my phone, so i called the customer care, again they asked me for 24 hrs, and faild to return my phone than also, so i dropped a mail to company email, but didn't received any replay till now. that is why i had to write this complaint here. its a very humble request that please insist them to give my phone back or my hard earned 25000 rs back. attaching the image of given service job card. and snapshot of sent mails. regards, Vishal Goyal