Sorry to hear you had a problem. We have all been there with some kind of boo boo! That's how we learn not to do THAT again!
Did you contact the manufacturer? They may have a solution. I'm sure you are not the only one it has happened to.
Also, somewhere, I read that you should not use fabric softener when using fusible web, that it might "unstick" the web. Maybe that would work? I may be wrong, but I don't see where it could hurt much to try it.
If and when you find the solution, please let us all know. Good luck.