Rude and undermining the client

Having had a Samsung battery problem, I went back to the store where it was bought only to be given the run around for about 4 weeks! The manager was rude to me and always spoke to me in a condescending manner. He eventually told me that my battery had not been purchased at his store BUT somehow was not under warranty either (how he got to that conclusion baffles me if he couldn't find the battery barcode in his system). I hate the way I was treated as he once even told me that he doesn't have time to resolve my issue because I'm not the only client and it's festive season. I'm extremely unhappy