The employment class action firm Sanford Wittels & Heisler won’t be invited to AT&T’s holiday party. Sanford Wittels already has a pending wage-and-hour case against one of the telecom’s subsidiaries, SNET, in Connecticut federal court. And on Wednesday, it filed two more cases against the company’s subsidiaries, one in Atlanta federal court and the other in San Francisco federal court. The actions seek a combined $1 billion in damages and back pay for roughly 5,000 current and former AT&T workers who were allegedly improperly classified by the company as exempt from overtime pay in violation of the Federal Fair Labor Standards Act.

As The National Law Journal recently reported, Sanford Wittels has had a busy year filing wage-and-hour class actions. It’s pursuing a $100 million class action against United Parcel Service, and cases against Costco, Northwestern Mutual Life and Valero Energy.