My new phone wont start up!

I've only used it for 3 or 4 days... My phones battery was low and i put it on charging.After some time i checked it wheather was fully charged or not. It was charged 95%.. I put it on charging for some more minitues. When i checked after some time it was off.. I tried everything and it wont start up. Visited the service center and they said that they think its board is dead..It was an abroad phone.. They said that i should give it back to the shop that it was purchased. They could only fix the phone...I cant give it back to the location where it was purchased. So please help me!