Need some COSTLY advice here

[RacerX5(215)]

I've had my '04 X5 4.4 for about 1.5 years now.. I LOVE IT!! I purchased it at a non BMW dealer. Went to BMW dealer about a warranty for it. I purchased one from BMW dealer, under the impression that it was bumper to bumper!! I remember being told that I can go to any BMW dealer to have it fixed if needed. It cost me $4000.00 I've been back 3x in the past year. First time they fixed the D/S folding mirror.. no charge. Second time I had to have the Thrust Rod & bushings replaced.. cost me $1100.00. Went back just yesterday for the License plate light.(right side not illuminating/ no power to it), going to cost me $200.00 + painting.. Should I just see about getting my money back for the warranty? I had it out with the service guy 2x already, asking wtf it covers. Tried numerous times to contact the Business mgr no response back yet. I'm sure they will pro-rate my refund, but somethings better than nothing!! Or should I just keep the warranty. Right now I have @ 55,000 miles on her.. Thanks for listening, and any advice you would like to offer!! Drive safe