The Consumer Financial Protection Bureau has filed suit against Capital One for allegedly misleading customers about its high-interest savings accounts.

The suit, filed Tuesday, alleges customers were cheated out of more than $2 billion in interest through Capital One’s flagship “360 Savings” accounts. The accounts were advertised as having the nation’s “best” and “highest” interest rates but instead were frozen at the lowest level even as rates rose nationwide, the Associated Press reported. While rates were frozen, Capital One created “360 Performance Savings” accounts that saw higher growth – at one point paying more than 14 times higher interest than 360 Savings – but the product was not openly offered to many customers, the suit alleges.

“Capital One did not specifically notify 360 Savings accountholders about the new product, and instead worked to keep them in the dark about these better-paying accounts,” CFPB said.

“For example, Capital One named and marketed the two products similarly; it eliminated nearly all references to the 360 Savings account product on its website and replaced them with references to the essentially identical 360 Performance Savings account, without notice that 360 Savings continued to exist as a distinct product,” CFPB alleges.

Capital One told the AP it disagreed with the allegations and was “deeply disappointed to see the CFPB continue its recent pattern of filing eleventh-hour lawsuits ahead of a change in administration,” adding its banking products have “always been available in just minutes to all new and existing customers without any of the usual industry restrictions.”

The agency is seeking civil penalties and financial relief for impacted customers.