They called, I didn't answer, they didn't leave a message. If it happens again, I'll add this number to the 4 gajillion (technical term) others I've had to block.
Received one call this morning that I answered (I live in CA so I answer CA-based numbers I don't recognize). It was one of those robots made to sound human. I picked up, said "Hello, this is _______" and it said "Hello, this is Tim from Customer Service. Can you hear me okay?" I hung up without saying anything else. Received another call several hours later; I missed the call.