SAN DIEGO (CN) - Wells Fargo takes advantage of customers who make math errors on ATM deposits by keeping the extra money even after it discovers the mistake, a class action claims in Superior Court.

Chase filed four lawsuits on Monday against customers who allegedly stole thousands of dollars while participating in the viral ATM glitch check fraud scam over the summer.

Customers participating in a viral trend that takes advantage of a "glitch" in its ATM system are actually committing check fraud, the bank warned.

JPMorgan Chase is filing lawsuits against customers who exploited a viral technical glitch this summer that allowed people to pull huge amounts from Chase ATMs.

Viral ‘Chase Bank Glitch’ promised people free money - but left them in thousands of debt and facing jail ...