I suggest you call Corporate, explain what has been done during those visits (just stick to the facts, no emotions and name-callings). Ask them for recommendations as "what should I do now" ? They will either direct you to another dealer, or call your dealer and straigthen them out. After all, they (the Corporate) got their image to preserve ! Believe me, if Honda does it, BMW will do that for sure !

Good luck !

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His : 2013 X5 3.5d Deep Sea Blue/Black/Aluminum with ALL packages, 20" 214"s, running boards, Adaptive Drive, Spare Tire, BMW Apps
On Order : 2016 X3 3.5 MSport Silver/Mocha with DHP, CW, Prem, Tech, DA, Lighting

Hers : 2015 328xi MSport Silver/Red

Prior:
2008 X5 4.8
2011 X5 3.5d
2010 335 xDrive
2013 335 xDrive