A debt collector will have more details than name and address. They would likely have employment history, next of kin, etc because that would be on the credit file. They might not have said where they were from because, due to the Privacy Act, they can't disclose the debt to a third party. That would include a spouse.
yeah that ^ sounds like collections to me but is weird if you're on the account. if your name is on the account then they should be able to speak to you as well. does he have any accounts solely in his name?