Lenovo Smartphone A 6000 — No resolution to the problems in warranty phone from 6-7 months

Address:

462001

Hi
Initially I was having Camera Related Issues in my A-6000 from last 6 months and till date didn't get resolution even after servicing 4 times every time i visited the service center every time they Overwrite the Software and returned it back to me and also writing several mails to customer support, tech support and even to their Head Tech Support Mr Ghosh even he couldnt provide me the resolution and now my device is getting Hang and the Apps get automatically stopped and still my phone is with service center here from last 15 days and now loosing faith in lenovo because what happen if my phone gets out of warranty.