Is this a porsche dealership?, is this a Factory warranty? Unfortunately ripping off the rear defrost isn't covered under factory warranty. It is considered misuse or abuse. With that said if you find a customer friendly service manager, he might be able to mark it up under defect and say the wire was ripped off due to the motion of the top coming down(assuming you have a boxster). Service departments are seperate from sales and they love almost all work they can get. You just need to tell them that if its covered under warranty you will do it. That is the carrot on the stick to help point them in the direction you want
. I used to be a new car sales mgr. you need to tell them simply gluing it on isn't acceptable as that is something your 5 year would do to hide his mistake.