Samsung Galaxy Grand Neo battery

Please note i have been to the store with the phone. The battery had started swelling thereby causing the phone to die within 6Hrs from full charge. I stated that this is my 2nd Samsung and i have never have had issue with the phone battery. The phone is literally 1 year 1 month old and on contract. Clearly there must be an issue with either the phone or battery. I was refused a new battery from the branch as it is apparently 1 month over the normal period. What is the point of having a 2 year warranty on the phone if the battery does not last the warranty of the phone.<br> I am certainly not happy with the service. <br>