Transmission Gear Slipping Problems of BMW 745

Transmission has been failing on my 2004 754li the first year I purchased it. I have sent to the vist BMW in cypress creek florida over 20 times it stayed in the their hands for weeks on end and always told me there is nothing wrong with it. For years it was a constant chore to drive 30 miles to their facility and for them to inspect my complaint to simply to tell me that there is nothing wrong with it. Low and behold my warranty expired and when I went there again, they said " well it seems like your transmission is slipping and would need extensive repairs". Immediately, I complained and began to request supervisors. They once again contacted the BMW north America supervisor who said they will not warranty this complaint regardless of the documented history. I have wasted over 100 days of my car being in the shop and at this point I cannot drive my car because the transmission is constantly failing and the car is not drivable. I paid close to 90k for this vehicle and plenty of additional monies for rentals and additional repairs due to the inability of the cars transmission to function properly. I don't know what to do. . . Please help in this economy the car's value has depleted and without a proper transmission it is almost worthless.

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