TÜV what should I do now????

It’s too puke… so I was running with the moose to the Tüv first quite well AU passed, brake super ect., then small break-in standlight broken, wiping water at the back doesn’t work. I was already looking forward to the new plaque. Then, the car was just on the pit, a call from below: “Ey, colleague look ma” Then two ingenors from below with the screw pulling on crumbling. Rust rushed audible and my hopes shrouded. Conclusion: In the rear area “Frame/bearing parts corrision damage with considerable weakening back li/re in the area of the AHK” according to report. Super! I to home, box bucked up and everything taken apart. What should I say now? rust but only the bumper holders! (see picture). The rest in the rear almost stainless and far from being rusted out. Calling the parts ordered with the comment: That’s not a carrying part! So what should I do now? Can I somehow get the gentlemen to pay for a cross?