Problem with my Local Board Shop

Ok, I just bought a 2004 Liquid Force Watson Handle from my local board shop. The plastic piece that covers the rope where the rope meets the bar completely tore and the EVA foam is tearing apart. I have used the handle about 5 times and it is already tearing. I talked to the owner and he said he would send it back no problem. Well my mom lives close to the store so I asked her to return it for me since I was leaving sunday night (the store is closed sunday). Well I get a phone call and they want me to pay shipping for the handle to be repaired. Should I be responsible for an $85 handle that lasted 2 and 1/2 weekends. I paid $85 expecting that I would be recieving good service and a warranty. He promised to fix have it returned at my expense. This doesnt make sense because I could have sent it back myself and paid shipping. I was hoping for better service on such a high priced item.