Prius III accelerator clamps?

Hello, have the Prius III for two weeks. The driving is also a lot of fun. So gradually you get to know the car. According to the manual and salesman you should drive the first 300 km comfortably, from 300 km you can also push on the tube which is stupid with this car but the first tank filling is just fun money. At the motorway driveway I gave so from 30km/h full throttle (to the stop) on the last 2cm gas path cracked something in the pedals I scared myself and went from this runte r. Unfortunately, the box was still full for about 1-2 seconds. This happens irregularly for me. At first I thought that the floor mat would have slipped under it and then give in (which causes cracking) but I can’t imagine that. Besides, it only cracks when the engine is on and not always. The bigger problem is that the car then shoots at full throttle like stupid through the area. Dealer has no idea, sometimes come by, well. The hotline “The colleague of course there was no answer and I am sure there is no Mr. Schmitz either. Should the box have a kickdown so this is not mentioned in the manual. What now? Greeting Peter