If the service manager is no help get the dealership manager involved. If that dosen't work ask to see the zone manager. They usually visit dealerships a couple times a week to check out problems like the one you having.
I had a crack in the floorboard in my 86 and the zone manager had to ok the repair.
so does the zone manager work directly for ford then? if so i bet it would be better to talk to him then once i explain it to him.
07 shelby gt500 537rwhp 520 torque whipple 160mm throttle body, vmp 1.6 supercharge pulley, JLT intake, sct livewire tuner, brenspeed dyno tuned, sequentials tail lights, window tints, low jack, 2010 shelby black/white stripe seats.
02 gt convertable RIP.. to many mods to list...