Debitor Called my work Prentending to be a Florida Prosecutor

When I received a call from my Job saying that I need to contact a prosecutor, I contacted them immediately. The person I talked to says that I am being sued for an unpaid debt back in 2012, I asked him why I have not received a notice in the mail. He went off on this whole tangent about me trying to defraud someone but I was trying to explain that I had not lived at that address for well over 2 yrs, he preceded to hang up. I called back asking for someone else he patched me through to someone who proceeded to just tell me I should get a lawyer without even asking who I was, I asked for information concerning the debit he told me he did not have time to tell me over the phone and that he will send an email, waited 2 days then called back and found out it was a collection agency when I gave them my case file they said it was no longer in the system and they sent it out as a refusal to pay. Never during the conversation did they say I needed to pay anything? Can I prosecute them?