Going Back For A 4th Service Call in 2 months. Advice?

[X5Boston]

My X5 is going back o the dealer for the four time in two months. This is to the resolve my heated seat which has still not be fixed. The original intent of this visit is to fix pieces of trim broken during the third visit. In addition, I am going to discuss a blatant lie on the part of the SA. Supposidly they "spent many hours on my issue and found no fault" but "as a favor" they swapped my seat anyway with a seat from a brand new E70 sitting on the lot. Turns out no swap was made since my seat looked dirty, as a result of filth left all over the vehicle from the third trip, and the heated seat still did not work properly. Turns out they only swapped the heating element although I am very skeptical since I've already caught them in a lie once. Plus they have not fixed the squeaking and rattling noise in back which was supposidly caused my me leaving a ice scraper in the rear cargo area. Of course the noise is still there.

To recap:
Out of service from the morning of October 2 through the evening of October 16
- Fixed two recall items
- Rattling noise caused by "a bad hose" Turns out they replaced a power streering pump. This explains to extremely heavy streering from the day I took I deilvery. This did not fix the rattle I had been hearing.
- Could not duplicate unusual shifting transmission
- Rattle and squeak was supposed to have been fixed with a new cargo cover.
- Front heated seat "working normal"
- No indications of dynamic drive failure (I do have pics to prove the failure)
- Front vented seat fan replaced to fixed noise
- CD player in dash activates from no reason but this is considered "normal"
- Loaner provided on week two. Written up by a very disgrunted shop person. "Full tank of gas" was only 3/4 full.

Out of Service from the morning of 10/25 through the evening of 11/09
- Work during the first visit broke the active seat feature. Seat only works for 1 - 3 minutes at a time. New motor installed.
- Rattle still present. Initially replaced the frint struts and even eventally diagnosed as a bad swaybar.
- Told the seat control unit was drawing too much power which caused heated seat issue. Issue still not fixed even with new seat control unit.
- Cargo cover finally in stock and installed to "fix" the noise in the cargo area
- Given a very filthy rental car as documented in a past thread. Seat sticky from spilled drinks, back seats covered in spilled juice, and moldy cups found strewn about. Low oil warning after the 2nd day.

Out of service from the morning of 11/13 through the evening of 11/15:
- Noise from cargo area caused by owner's ice scraper. Not the case. Noise is still there
- Swapped out driver seat for a new seat to fix issues. Untrue statement. Seat still broken.
- Another dynamic drive failure. "Found two older error codes" which suprised me since apparently there were no error codes. Steering angle sensor recalibrated
- Transmission still shifting roughly but this is "normal"

Going back in on 11/26 for the noises in the cargo area and driver seat issues. At this point what is the best course of action? I am going to at a minimum ask for the extended warranty. With issues like these, I can't imagine what I'll see four years down the line. Does that sound fair? Does this sound like enough to consult a lawyer about lemoning this X5? I've also been told about a "buy back." What would that entail?

Thanks everyone.