Mounting tyres on the Audi R8

Moin. During the tyre change at the company Reifendienst Berner, Bad Oldesloe a damage was recorded on the threshold of my R8. It is assumed that also the frame got what. In any case, the threshold, or the lower frame cladding is bent and the gap dimension of the side part sitting above the threshold is smaller than on the left side of the vehicle. Does anyone know about the structure of the frame and the fastening of the threshold? What can the bracket be removed if you use the car lifter u nter places this point? On a visit through a nearby Audi center with TÜV expert they wanted to dismantle the threshold in order to see what else has broken. However, this is associated with costs that I have to spend. The tyre service rejects any responsibility. Also the complaint office of the Chamber of Crafts could not help. Only the complaint path remains. Has this happened to you before? Greeting Uwe