Yuphoria — yu5010a

My mobile yu5010a started causing problem (Battery automatically deads, at 40% or near it suddenly shows 0 and mobile shutdowns) in its 7th month after that it has been at service center for 3times and 1 time for head office for 1 month but problem remains the same. Every time when i heads to service centre they just asked me to leave mobile at center but company is unable to solve my problem. And they are unable to provide me its battery