I just got a call from this number, I answered it and they were singing????  Called it back and they answered "account services"

I received a call from this number but didn't answer.  About an hour later I received another call, I didn't answer the second call either.  They did not leave a message either time.

Received a call, I answered it and said hello several times before they finally hung up on me. It sounded like someone was on the other end but just not saying anything. About 2 hours later I received another call from this number. This time I let it go to voicemail. They left a 14 second message but didn't say a word.