Escalate it. Start raising heck....Tell her that you no longer want to use that dealership. Tell her that BMW has a legal responsibly under the terms of the warranty, and you will only speak with BMWNA about how THEY will fix your problem.... Explain that you will give them another chance prior to contacting a lawyer for a lemon claim...

Yes, they don't want to have you talking to the rep...but if you jsut say "oh, ok...let me know what they say" you will get steamrolled. Stand up and assert yourself.