Signed up for a 36 month interest free Chase ( circuit city ) card to make purchases on 9/7/2007. Made double payments in order to pay off debt before grace period was up. Twenty-nine months into the contract, I get my March bill with the accrued interest added. I have the original receipts and the credit card contract. My response form Chase is PROVE IT. They state that their January statement indicated the interest free promotion for me would end on February. Since I knew my grace period did not end until September, I did not look at the fine print. Unfortunately for me, my paperwork states the end date as 2010, with no month specified. Shame on Chase. Hopefully, this message will get out to others and avoid this scam.