If a separate debt, IMO, they are not in violation. The purpose of their call is not for you, but for your DW. If the call was for you, then YES, definately in violation under Sect. 805 (c) for Ceasing Communications & Sect. 809 (b) for the DV for Validation of Debts.
Try sending a Cease and Desist letter referencing Sect. 805(c) on behalf of your wife.