hang-up after a couple of rings. have received several similar calls from this number before.

Three calls this morning.

Three calls this morning, inside of thirty minutes. Called them back: number is "disconnected" or "not in service", so the number is spoofed. No one speaks when I answer.

Received a call from this number on 01/02 and no one picked up on the other end, went on for about 12 seconds

Rec'd call mid afternoon, when I picked up, a voice asked to speak to someone, I think. I said, "excuse me?" then they hung up.
I blocked the # on my mobile