Wiley Rein is fighting back against claims that it overbilled a Bethesda-based software developer in a legal battle the developer lost, accusing its former client of stiffing it on the bill.

The Washington, D.C.-based law firm has filed a counterclaim against AirFacts, an airfare auditing software developer, alleging it hasn’t paid at least $221,857.08 in legal fees that the developer racked up in a lawsuit against a former employee.