A vibration would probably off the clutch release bearing being shot or misaligned not the clutch plate it's self dying. Older BMWs have a problem with bad clutch judder when the clutch is dying i had this and then the bearing through its hand in and i had to drive home with no clutch which is fun in a manual.

Now if you still have a problem it might be something misaligned in the clutch assembly it might be some muppet working on your car.

I got a BMW and it is fine getting on abit but still runs fine you might be unfortunate and got a lemon or a bad dealer.

But i love mine the best diesel i have ever driven