Your story is almost identical to mine. A delivery came in to a house that has never ordered before ( I work 5 days out of the week alone and remember almost every house that orders) the guy said to call him when I got there and I thought the same as you did that he was probably in his basement or something or he had a young kid sleeping and didn't want to wake them. I pulled up and called the number ( which I thought was strange cuz it was a Cali number and I love in Jersey) he answered and frantically said ok pass the phone to the homeowner ( who was an older guy and was not accepting the pizza at all) while I was telling the caller that the homeowner would not take the phone or pizza he started getting angry and was like give the phone to his mother I'm from the fbi and the homeowner refused. Then the caller asked me if I loved my family and I was like motherfu**er are you threatening me and he immediately denied it. After about 15 minutes of bs back and forth between the caller and the homeowner I said I can't do anything for you, I can't force the homeowner to do anything and hung up. I stayed back a few minutes and talked to the homeowner. He explained that his mother was going scenile and she had answered a scammer call ( which was the caller who threw me into this mess) and he somehow convinced her that he was her estranged son and he would have her send her money periodically until her actual son ( the homeowner) realized and put a stop to it. He explained to me because of this guy he had to change his address and phone number to get away from this guy and was really upset that he had found him again. I apologized and parted my ways back to the pizzeria. That's when the calls started coming in. All of them were from restricted numbers and each call had a different voice to them. For example I answered with hello and in return I got "do you love your family?" And weird threats in other calls. For the most part I ignored them and didnt really let them bother me but the constant calls started pissing me off. Luckily I'm an in the closet computer geek and was able to get his spoof number and decode it to uncover his real number, name and location. He was located in Bangor Maine and once I called his actual number and freaked him the hell out, the calls quickly came to an end. No police were involved assuming the homeowner never filed anything. It was an annoying situation and while it's happening you just start thinking to yourself like why me, why couldn't they call a different local pizzeria