What seems to have happened is, the sales person should have advised you that the front aero bumper does not allow the fitments of the front sensors thats why you were allowed front sensors and I was not. There are 2 FL front aero bumpers, one for cars with washer jets and one for cars with out.
When ordered from the factory, the car would be delivered with standard bumpers and front and rear parking sensors, the
dealer would then have to have the front bumper, skirts etc, fitted because they can not spec these has part of a factory order. At the point of fitment they should have contacted you to say you can not have the sensors before removing the front bumper. Thats at least 2 departments of the
dealer that should have pointed this out to you.
It seems like you have 3 choices,
Try rejecting the car.
Have no sensors and compensation.
Have standard bumpers back on (may skirts removed) plus refund and compensation.
Hope this helps.