Rip off and very rude took my boat in for a miss i...

Rip off and very rude took my boat in for a miss it had they went through it trying to find the problem witch they never did but they charged me $750 for a new set of spark plugs that I had changed a couple of weeks before I took it in they said they were the wrong ones.they were not.so they tell the motor was making some bad noises when they started it and that it may need a rebuild .so I said no it s fine so I picked up the boat and I fixed the boat my self and the motor had zero issues so$750 for nothing beware.