First, ask for a manager. They may be able to grant what was advertised, even if the ad was in error. Or more likely they will point out the fine print that limits their offer (yes, 10% interest, but only on the first $1000 for 3 months). But maybe they will just say no. If your newspaper has an Action Line, that might help. Or you may want to contact the District Attorney's office about fraudulent advertising.