Thats the only way to get shit done at dealerships...Yes. When they were first installed they never leaked.
Then the dealership screwed around doing some engine work and they leaked when I got the truck back.
I just kept taking it back to them for rework until it finally dawned on them that I wasn't going to give up or let up on them until they finally said uncle then buckled down and did the job correctly. No I didn't pay them anymore either. They were paid to do the job right the first time. If nothing else, I am a presistant SOB and it usually pays off.
It hasn't leaked since. All it takes is time, patience and someone paying attention to detail and having a little pride in their workmanship.