Who cares? I mean really? Who cares who it is. I don't know. You don't know. I'd say it's probably someone, from some part of the world trying to steal from you. Forget about it. Don't call it back.
Windows support scam call. I asked a simple technical question "What is my machine's MAC address?" and the scammer got hostile - "Your wife! It's the MAC address of your wife! Do you hear me?" Then he hung up. Imagine the nerve of some people to question the guy calling to con you!
Sounds like what I do, except I ask them for the IP address, which they MUST know if they are communicating with it. To get this address requires a bit of monkey motion, logging into my router to get the actual address. It used to be that they would either ignore this question or try to give me a local net address, 192.168.somethingorother. I would try to carefully explain the difference between a local net address and an Internet address, but lost cause, I would have more luck explaining it to my cats, their breed is actually pretty bright as felines go. Now they usually just hang up at the first mention of the words "IP address". I sometimes ask them how I can be having Windoze problems on my Linux machine (I have two of those). That really takes them off their scammer scripts!
One time I took the call. "Oh, my! I'd better get that fixed. Let me start my computer." [five minutes] "OK, it's coming up now. It's so slow!" [3 minutes] "Oh, crap it just crashed. This is bad! Let me restart it." [5 minutes] Etc.
Kept the weasel on the phone for about 20 minutes before he figured out I was F-ing with him.