Renault megane 4: Some time after coupling changes the problems started

Hello, With my Renault Megane 4 the clutch has been changed after 2500 kilometers and now after 1000 kilometers it makes a funny dull sound at the dome. When lightly gas out and give it starts to move and makes the same noise as when dome and the shift knob moves extremely up and down, as if it would jump out of the aisle and jump back back into the starting position. It was then changed because of this problem of the 2 mass swing and The workshop says that now everything you can change has changed and I wanted to ask if this is so right or if there is something else that could be there. Maybe someone can help me with this problem and thank you in advance.