M.W.
I would contact the company and see if they can help you repair it. I did that with my Maclaren stroller recently - the stroller canopy was bent badly during travel. I shipped the canopy to them and they sent it back fixed. I had to pay $25 but it was worth it to have it fixed.
Or, I would try to find a tailor on your own that can fix it - should be a pretty simple fix. They probably would have you buy the zipper for it and bring it in.