My Heavy Bag Unzipped......

So, I didnt unzip it or anything I was just working out on it today and the zipper just ripped all around the bag. I didnt notice it until I saw all the lil strips of cloth popping out of the top of the bag. I know it is about impossible to zip it back up, so should I just take it to the sporting store I got it from and let them fix it or buy a new one or what? And, has anybody ever had this happened to theirs? And it is an everlast 100 pounder. I guess everlast doesnt last like I thought it did. Any suggestions?