The Georgia Court of Appeals has upheld the certification of a class action lawsuit against SunTrust Bank alleging as many as 400,000 customers have been charged exorbitant overdraft fees.

Named plaintiff Jeff Bickerstaff Jr. filed the lawsuit in July 2010 challenging the bank’s overdraft fees as excessive. Bickerstaff said SunTrust charged $36 when customers overdrew their accounts, even by small amounts, with debit card payments. The complaint claims the fees amount to interest rates as high as 1,000 percent and violate the state’s banking and finance laws.