Warehouse workers in New Lenox accused a staffing agency of shorting their wages, denying them overtime pay and, in some cases, paying them below $8.25 an hour, the state’s minimum wage.

The workers filed a class action lawsuit on Monday in federal court in Chicago against their employer Reliable Staffing Group, Inc. and the company contracting them, Schneider Logistics Inc.

The workers were hired by the staffing agency to unload boxes from trucks and put them on shelves at Schneider’s warehouse in Elwood, Ill, according to the suit. They were promised $10 an hour, plus a rate for the number of boxes they would unload. But the promise was not issued in writing, and workers were not paid as promised.

Later, when workers tried to get information on their wages, they were “rebuffed and threatened with being taken off the call back list,” according to the suit.

The suit seeks to recover workers’ unpaid wages in the last three years.

Reliable Staffing Group and Schneider Logistics couldn’t be reached for comment.