Credit Card Companies will do that when you score isn't where they think it should be and then they will increase your APR so that you'll move the balance else where. Have you rec'd any other offers from other credit card companies offering a low rate? If not maybe the way to go is to do a home equity loan to pay it off and take the interest you pay on that as a tax benefit (in most cases home equity loans the interest is tax deductable).
Credit Card Offers Debt Consolidation