Clutch suddenly not disengaging after high revs

[Hendrix]

I bought the parts from the brand LUK and had the whole clutch replaced.

Due to not having the time to do this myself outside with minus 10°C (14°F), I had it done by a mechanic known by my neighbor for half the amount the dealer charged.

The clutch was deceased, the springs (fingers) were colored blue from the heat.
There was some drag traces on the end of the spring fingers as well as on the concentric hydraulic bearing.

So what happened?
1) Given the fact that the clutch failed at high revolutions
2) and the springs seem to have gotten too hot causing the losing of their pre-formed shape.
3) considerable drag wear on the end of the spring fingers as well as on the bearing,

Makes me come to the conclusion, the bearing failed to turn at the same speed as the clutch pressure plate, causing it to get hot real quick and lose the spring shape / force of the fingered spring, causing the clutch to not completely disengage anymore.

Verdict: Yaris is no race car and it's bad quality & bad designed pressure bearing, causes it to be a bad idea to try and outrun a Dodge RAM at the highway ramp up. (Next time I will take the 1994 Volvo 850-T5)

Well anyway I have a complete new clutch, the main cylinder was still ok so I have a spare now, the rest I will dump in the metal collection waste container at the local garbage collection point. 800€ for the whole change, with a spare 150€ main cylinder in the closet (all plastic!!!! unbelievable, same as the hydraulic bearing housing).

Thank all you guys for the input... happy new year everyone!