Called my work and said I was about to be served unless I called a number he gave me to resolve the issue. I called and the number belongs to Newmark

Same thing--called my WORK and said they haven't been able to reach me at home--which is a lie because they've never called me at home. Debt collectors cannot issue a garnishment or serve papers. Only through a law office/court order can that happen. They can mail stuff to you--if they can find you. Cannot believe they would call at work--at least we have caller ID so can aviod that problem again.