how to restore contacts that are somehow now deleted in hotmail? Memo note says they were filtered out by me? NO

Well, this is a new one on me? Its my contacts, all removed. The memo in that page says, "All contacts deleted and filtered"? What the **** is filtered? I never deleted my contacts, I printed a full list about a week ago, nothing happen? Is this the result of an error or hack F---. Anyway, is it possible to obtain them back? Or find out what happen? What setting need to be checked, in mail or wherever? Never had this one before. Many thanks, Paul