astrazeneca may be able to help. Now you may not even know you're spending it. A lot of us who do not look at our credit card bills closely enough are paying an average of $256 a year in extra charges... See More
astrazeneca may be able to help. Now you may not even know you're spending it. A lot of us who do not look at our credit card bills closely enough are paying an average of $256 a year in extra charges and fee you may not know you had. ABC's Rebecca Jarvis with our real money team to show you how to get your money back. Reporter: Wesley and Mike from Indianapolis thought it would never happen to them. Definitely not something we were buying. Reporter: A $463 charge for a high tech canyon camera. This was the fraud? It's not just fraud charges. About one in four are victims of what they call gray charges. That's what happened to Tom of New York. He thought he cancelled a free trial wracking up $39 month live charges. Mae gan from New York found out her gym charged her $250 extra in fees. And Matt from D.C. Discovered companies were charging him twice for the same service. We're the mayor. Reporter: You can protect yourself by scanning your bills regularly and closely. One in ten of us actually do. Enter a new company called billguard. My mom told us you need to check your bills but most of us simply don't. Reporter: Services like billguard can help you monitor your bills by scouring them for questionable charges. Deceptive and misleading that end up costing us more money than we assumed we would be paying. Reporter: Billguard makes it easy to fix. Click this button to send an e-mail to that business or credit card. You get a response e-mail and your money back. Without waiting on hold. Right. Reporter: They also found Mike and Leslie's fraud and track every charge. You have been enjoying arby's and dairy queen? Yeah. Reporter: Knowing even the small ones could add up. Rebecca Jarvis, ABC news, Indianapolis.
This transcript has been automatically generated and may not be 100% accurate.