in 2017 I did a construction project. permits were open for the general remodel and the plumbing but I just found out there was not a specific electrical electrical permit. the permits that were opened were closed and approved. The home was built in 1912 and had "knob and tube" electrical that needed to be updated. I have an invoice from the contractor - he billed us to both redo the wiring in the home and update the outlets to GFCI. We are selling the home and it is in escrow. During the inspection, we found out that the rewiring was not done and the outlets were not grounded and now we are on the line to give the buyers $3500 for this work we have already paid a contractor previously for. The contractor was extremely difficult to work with and we cannot contact him now. Do I have any recourse? My real estate agent says that I can file against his "bond" but I don't quite understand how that works.