inferior products

Went to samsung brooklyn after being advised by e-mail from samsung as the s4-s battery is again swelling up - 2nd battery dping this and my contract has not even expired that the stupid phone be checked out. Samsung brooklyn refused to help just saying there's a 6 month guarantee only on the battery buy a new battery. Well thanks a lot samsung - obviously making money from giving inferior products and then having the customer buying a new one. Pathetic! ! I explained the phone is still under contract. . Nope that's got nothing to do with the battery. So it's fine to give a decent phone but stuff like a battery does not form part of the package?? Thanks a lot for wasting my time