I was once invited to a similar survey after having my P 106 serviced.
The questions asked where only about time of delivery to the dealer, time of return of car. The cost of service. And the like.
There was no option to adress the fact that the car was repaired due to inferior quality.
So they measured satisfaction if the pos was delivered after service on agreed time. Not that I was having a dispute about quality and cost.
Sorry about being negative though.