I had the same effin thing happen with SF when I bought my ZX6R this year. My original quote from them was $75/month, long story short, I bought the bike and am now paying $130/mth. Still not bad, but enough of a piss off to be paying almost double what I was originally quoted! I feel your pain !!
By the sounds of it they quoted you with a car policy too.
I got my quote from them for $69/month w/car and $119 w/o car