I once bought a high beat 18037 (I think that was the number) that should have had a bark bezel but instead had a fluted bezel (Rolex part). RBH said they would not service the watch unless I had them put the correct bezel on it. However they did not confiscate the watch nor the part and gave it back to me when I declined service.
I brought them another Rolex on a generic strap. They accepted the head for service only after I removed the strap.
They decline to accept another Rolex of mine when they could no long get the parts needed to perform the service.
However they have serviced many other watches for me without problems.