Navient Debt Collection Complaint

Navient Debt collection department,

I do not know Disclosure verification of debt Not given enough info to verify debt Texas

I was contacted today at work by -, claiming to be a debt collector and that this was a personal business matter, however the caller did not state who they were, what the debt was, nor would they verify the information that asked about. This same number has called my cell phone, with the same lack of information. They are asking me to verify personal information, and want me to answer their questions, however when I ask for a reverse verification they state that they are unable to provide me the information that I am asking for, unless I provide them my personal information.