Would a private process server call my place of employment to verify a time to serve me legal papers?

Asked in Sacramento, CA - 6 months

For the past month, I have been receiving calls at my job from a man named "Steve Woods" claiming that he works for himself and the he was hired by a company called Nationwide Services, Inc to deliver legal documents to me. He wants to verify a time that I will be available to drop off the legal papers. I told him to send it in writing or serve me at my home, I'd be there after 4pm and he said ok, can you verify that I have the correct address, I said no, I'm sure you should have all the right info, do not contact my employer anymore. He still calls and leaves voicemails at my job attempting to set up a time to deliver his "legal documents". Is this legal or valid? I've asked what it's regarding and he said I could call the company who contracted him to resolve the matter.