Received phone call on my work line. Individual said it was a personal business matter and would not disclose the nature of the call. I then asked for the name and phone number in which to return the call because I was at work and could not discuss such things. He would not share such information. I then requested for him to not contact me at work, and he then asked to speak to my supervisor. He continued to badger me and I then mentioned to him that I will report him if he continued to harass me. He then said that he 's going to report me. I hung up the phone as work is not the time nor place to deal with harassment. He did n't state where he was from, what the matter was in reference to, his name or any additional information. I did advise him that this was a federal line and that I would report him. In turn, he said he would do the same.