You should be very concerned, you have made some horrible decisions here. Holding payments due to mechanical problems did not resolve the problems, but created some big problems for you.
You have two separate issues going, and you failed to notice. One, the mechanical problems. Two, you trashing the credit score.
If you have ongoing mechanical problems, you talk to the service manager. If that doesn't resolve it, you go the general manager. Still not happy? Ask to talk with the district service rep. But you have got to have a legitimate complaint, you cannot go in saying you have a weird drivability problem at 85 miles an hour that a tech cannot diagnose. Or that your sunroof rattle going over this bump on this road and that is the only time it happens. You need to have a usability problem before you are going to get response.
I had two Fords in my life. One was an F-150 I couldn't wait to get rid of, I bought it with 6,000 miles. I wondered why some one would trade it for another truck so soon. It spent a couple days a month at the dealership with various issues, mostly no start and had to be towed in. The dealership never could fix it and I finally traded.
Anyway, I digress.
You made yourself a mess by thinking holding payments was punishing the company for the mechanical problems when you were only punishing yourself. But since leases are such a great deal for the dealership and the company, you can probably get into another crappy lease without much problem.
But I'd like to think you have learned something from this....