Got the same call here in Winnipeg Manitoba Canada- just before 6:30 pm our time tonight Jan 6/13. Thought I saw 204 which is our area code so answered - said hello twice , waited a few seconds and heard the click.
what i did was buy a phone with number block as one of the features. Now when i get a blocked number or number unknown it rings once and then disconnects the call. I have the option of adding up to 30 numbers to the block number list on my phone and works quite well !!!