Not to be mean but, if it fell off back to the original surface that you prepped to have top coated, either it wasn't prepped right OR, the prepped surface is failing (oxidation) causing whatever is on top to let go. I don't think there is much the shop can do about that as far as warranty goes.
If you'd like, I'll pm you my # and maybe able to shed some better light on what may have happened.
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