Unknown caller. when you answer the caller hangs up. Call back you get "you were in a servery, but the time has expired, press 1 to remove your self from the list"
This happen to me about 3 weeks ago. I press 1 and still getting calls.
I had this happen with another number. I typed "Idiot" in my contacts for that number. Every time it came up I knew not to answer it. After a while, whoever it was, stopped calling.
Got a recording from "an independent survey group" wanting 30 seconds of my time to answer questions about the current election cycle or some nonsense and I would win cruise tickets for participating... I hung up after that. I don't know why the caller ID said YAHOO, but that must be the target audience they think falls for this. Blocked on the Ooma blacklist now.