Marineland Boating Center - Steve D. Sold me a flare/signal kit that had been expired for two years, and refused to make it right. Waco Texas

I purchased a Yamaha boat from Marineland Boating Center in Waco Texas, and subsequently brought it back to them for the first service at 10 hours.  The purchase process was very efficient, and it was a real pleasure dealing with "Captain Jack". Marineland has competitive pricing on the boats that they sell as well as on their accessories and service.
Unfortunately, the service that I received was inadequate. 
1. When the oil was changed, they did not follow Yamaha protocol because they did not warm up the engines before extracting the oil. I know this because they were not in possession of the boat keys when they changed the oil. One of my engines had the correct amount of oil in it, 3.8 qts, and the other engine had too much oil in it, 5 qts. 
2. One of the cup holders on the rear swim deck of the boat was not draining, and to correct this, the technician stuck something down the drain hole to unplug it. I questioned why the water was not draining out of the through-hull drain fitting (where it should have), and I was brushed off. It turns out that when the technician "unplugged" the drain line, he actually disconnected it which caused the water to drain into the bilge instead of onto the swim platform. This is a problem because the cup holder in question constantly gets filled with water due to its location on the swim platform. Long story short, the problem was misdiagnosed and their "fix" made it worse.  After being brushed off by the service advisor, I took the cup holder assembly apart and found that the root cause was a pinched drain line. I fixed it myself.
3. I reported to the service advisor that my boat leaked such that the bilge pump would run while the boat was in the water. I was told "they all leak". My service invoice says that they tested my boat in their water tank and that no leaks were found. They did not test my boat in their water tank. They don't have a water tank that holds a 24 foot boat.  I later took my boat to another Yamaha dealer who properly diagnosed that my boat had some major leaking thru-hull fittings.
4. Their technician cross-threaded one of the engine cover bolts when he was changing the spark plugs. I had to fix this myself by using a tap to restore the threads.
Not only would I not trust Marineland to service my boat, but I will never do business with them again. I understand that mistakes can be made, but it's important that they are corrected. For example, they sold me the wrong anchor and wrong mooring cover, but they corrected that. They also sold me a flare/signaling kit. The kit retails for $100-$150 depending where you buy it from.  On the day that I received the flare kit, the flares had already been expired for two years. It was their mistake. When I told Marineland that they sold me a flare kit that was expired, they did nothing to correct this. I even suggested that they did not need to give me a whole new kit, just recognize their mistake and do something to make it right, but they did nothing. This is very disappointing, especially considering that their mistake is safety related, and could have resulted in a coast guard fine.