If you think you might have given information to a phisher, the first thing you need to do is contact the company the e-mail was spoofing. Then you should immediately change your password for that site. If that password is one you use commonly on other sites, you should change all of those as well. If you gave out your bank or credit card account numbers, you need to contact those institutions.
In addition, report what happened to a credit reporting company, such as TransUnion. You should also file reports with the Federal Trade Commission and the FBI by way of the Internet Crime Complaint Center.
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