SAN ANTONIO -

It took a few months, but Julia Rosales saved $3,000 to buy a bigger vehicle for her growing family.

"I went from two kids to five kids. My boyfriend is a single dad of three, so we needed a bigger vehicle," Rosales said.

Rosales went to Randolph Brooks Federal Credit Union, where she banks, and withdrew the money.

But when she tried to use it, she got a big surprise.

She said a security guard at a later location put it up to the light and it came out that it was fake.

"I was like, 'No way, I just got it from the bank,'" Rosales said.

Per protocol, the bill was taken and sent to the Secret Service.

Rosales went straight to Randolph Brooks to report what happened but said they didn't respond the way she had hoped.

"She didn't even bother to look up my account," Rosales said.

Jackie Carter, with the Secret Service, said they've seen an increase in counterfeit bills, likely due to the economy.

Carter said there are ways to tell if a bill is counterfeit such as threads you can see when you hold them up to light and color-shifting numbers on the bottom right of most bills.

"The ink will shift from green to black," Carter said.

Sonya McDonald, with Randolph Brooks, released a comment.

"While we can't get into specific procedures for security reasons, the likelihood that a counterfeit bill came from RBFCU is low," McDonald said.