[Resolved]  Samsung — samsung galaxy core 2 phone automatically switched off

I have purchased a mobile set of Samsung Galaxy Core 2 ondated 18.10.2014. It is having problem of automaticaly switched off. This problem shown to shopkeeper on dated 22.10.2014. They have reboot the device and said that it will not have problem again. But same problem faced next day. Then i have visted to samsung care on dated 25 th, because there were holidays of 23 and 24 th for dewali. On 25 th, Customer care center updates the software and confirmed that there problem of switched is corrected. But again same problem observed . On dated 28 the again went to customer care and they have changed the battery and said now it will no give problem of switched off. But, now there is same problem of automaticaly switched off. I request you to please change my handset or refund my amount. I am fed up by these problems in new handset and this is from day 1. Now hanset is at customer care since 3rd Nov.