The lawsuit alleges that Walmart deposited drivers’ pay into accounts with payment platform Branch Messenger without the drivers’ consent.

The Consumer Financial Protection Bureau filed a complaint Monday against Walmart and Branch Messenger for allegedly forcing delivery drivers to use costly deposit accounts in order to get paid.

The U.S. consumer finance watchdog accused Walmart and the workforce payments company Branch Messenger on Monday of forcing more than a million delivery drivers into using accounts that cost them more than $10 million in junk fees.