Hello,
We are awfully sorry to hear what happened to your zipper end panel. The standard zipper end panel does include a one-year warranty and if anything goes wrong within that time frame, we strongly suggest submitting a claim.
Please complete the warranty claim form here: https://www.shelterlogic.com/support/forms/warranty-claim/
If you have any questions or concerns, please contact us at 1-800-932-9344.
Thank you