It squirted white and the speed went into the 6000 range!!

Hallößen, I have the following problem, on 01.04. I drove home with my Golf IV TDI, I stood at the traffic light and drove off, turned on into the second gear when I realized once again that my car took the gas net more properly, then I switched on to the third and also here he did not take the gas any more 100%. Then I stepped on the gas again and then the car pulled at once like a flash and went into the 6000er area and went no longer for unfathomable r one minute back (there I was already off the gas again), the other it squirted in the back very strongly white from the exhaust. Now my question??? What could be over to my car?? What costs would I have to reckon with??? Because the workshop said after a short look into the car that the cylinder cop seal, the pistons and the turbocharger is over, in the worst case it is a motor damage!!! I would like to thank you very much for your answers and wish you a nice Easter!! Di e collolili