[Resolved]  HTC — they are not give a replacement of handset

I purchase this handset at 23 Nov. 2013.and i facing problems from 22 Jan 2013 within 2 mounts.I visit to those service center but they are not solve this problem. htc service center people are say to me that mobile is not good in performance and they suggest me to sold this mobile.i talk with htc customer care executive those people are not give proper solution.service is not good because they are not troubleshoot this "auto restart phone" 5 time i submit my mobile to those service center again 12 Oct .2013 submit my phone to those service center please give some suggestion