Financing Help

[2005_X3_2.5I]

Hello, I just purshased a Brand new 2005 X3 2.5i. I acutally planned on getting the new 3 series so i had not done any research on the x3 like i did on the 3 series.

I feel in love with the X3 and decided to get it.....no complaints....except for the financing.

When i got there the sales person said he wasnt sure what the rate was on the x3 2.5i but thought it was 2.9.....well he came back and said he was wrong it was 3.9% which isnt bad either.....well when i got home i checked edmunds and on edmunds it says that for the month of august the rate for the 05 x3 2.5 is 2.9%. So what i feel maybe they did was mickey mouse me around......by telling me they'd give 1500 off msrp and then making it up on the interest.

I called the finance manager and he said that their dealership wasnt giving that rate and instead have been giving everyone else 3.9% so that there was nothing he could do.

My question is......is this legal?? Anything i can do??? Please give me advice..