Ofcourse, they can. It's called a "preference recovery action." It seems as if your customer filed a Chapter 11, and they have either confirmed a plan of reorganization, or recently converted to a Chapter 7. Sometimes it happens when the debtor filed a Chapter 7 originally, but trustees usually move faster in a new 7. There are several defenses to preference recovery actions, and
trustees/debtors in possession like to settle the cases. You need a lawyer immediately.