2004 BMW X3 Seat Warmer Repair Issue

Hi, The dealer replaced the driver's side seat cover. Coincidentally, the driver's seat warmer did not work at all afterward (but the passenger side did). I returned the car to the dealer where they changed out a switch (I think something related to the actual button that turns on the seat warmer) and made some computer adjustments. After this both seats barely warmed up. When in the 'III' position they felt as if they were actually in the 'I' position. Needless to say, I've returned my car to the dealer 3 separate times where all they've done is replace the same parts over and over again, including the seat covers on both seats. I've had my car for 4 years now and I know for a fact that the seats previously warmed up significantly hotter than they do now. The dealer is telling us that what they've done and tested on my car meets specs and that they are not sure what else to do. They also mentioned that they put some laser thermometer on the seats and they measure at 80 degrees. My husband thinks (and mentioned to them) that something was probably turned down on their end (I don't remember what he specifically referred to. Maybe some circuit or something). Also, I do not have leather seats and they keep saying that my kind of seats don't warm as hot as the leather seats. Again, I know that my seats should be warming up significantly hotter. I've requested all of the service notes and hope to receive them later next week in case you need more info. Seems to me that the service techs should have done a bit more research or tried something 'outside of the box' since changing out the same parts 3 times did not fix the problem. I sure hope that you have a suggestion that I can pass on. Thanks, Jen Elson