I had a similar situation. I called and told them they owed me for 2 hours of my time as a contactor to clean up and sent pics. I got $375 off my bill.

FWIW, I replaced a 1988 microwave in 2008. The difference in performance was incredible. It no longer takes 5+ minutes to boil a cup of water. I heartily recommend a new microwave. Mine is a Sharp because I wanted the sensor reheat feature. I love it. Almost 20 years, and still great.