HTC — My phone was not working correct

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New Delhi, Delhi, 110007

My phone was not working correct I bought htc desire 626 g plus .there r many problem in my phone.my phone was power off automatically and not show my contact .when i click on contact option, contact was load and it take 15- 20 mins and after that phone was show 0 contact list.when i make a call, the dialler screen was come after 30-40 sec and dialler was not responding, after 30-40 sec the call was dialled. When try to cut the calling call. The hang up screen was show and does'nt go, it consume 15 sec and more and when i call somebody, during the call the phone vibrater is on and after few second phone was restart automatically. When i go to htc service centre, service centre was located in jaipur, mall 21, c-scheme, near panch batti. i told to sevice executive about the my problem.he change my phone software but all in vain . Kindly solve problem urgently. Date of purchase -7/07/2015 Model no -htc desire 626 g plus blue lagon dual sim No of attempt in service centre -3 Phone imei no-[protected] Phone number-[protected]