I feel I had an incomplete frame inspection on a r...

I feel I had an incomplete frame inspection on a recall - they undercoated instead of frame replacement and now I have bed pylons rusted off and a rear crossmember just forward of axel rusted away where it meets the frame. Just told me I'm SOL. I'm am contesting the work performed during the frame inspection and how thorough it was- this kind of metal degradation doesn't happen that rapidly... 870,000 of our trucks were recalled for a reason. Both of my rear springs broke 9 months apart and were replaced prior to that particular recall before this one - was that a tell maybe? Is it my responsibility that the frame degradation was missed?