Eighteen months ago, I had a body repair to the wing & driver's door of my 65-plate Audi A3 via insurance, after the car was damaged while parked. The paperwork from the insurance-approved repairer offers a guarantee to paintwork for as long as I own the car.

The edge of the driver's door where it meets the wing is now starting to peel away showing rust underneath - either not finished correctly at the join, or there is also a rubber strip inside the wing which seems to be slightly askew and perhaps wasn't aligned properly and has been rubbing on the edge of the door when it opens.

In terms of the "guarantee", do I return to the repairer, or contact the insurance company (who I am no longer with). Can I expect a courtesy car (as can't see how I would manage without a car for several weeks) as this was part of the original insurance package?

Thanks