You may want to know about them if you've ever had a problem with a credit card or loan held by a national bank. The Office of the Comptroller of the Currency, or OCC is a federal agency that charters, regulates and supervises national banks.

We recently visited the OCC's Consumer Assistance Group in Houston, Texas, where they handle all the complaints. The staff are knowledgable and there to help you. So, if you have an issue with your national bank, you can either call them at 1-800-613-6743 Monday to Friday 7 to 7 CST, or click here.