Dito here. Rang one then hung up.
Spam called rang once and hung up. I did not call back.
they called, rang once, hung up. apparently they want you to call them back so that they can market to you.
Called, no message left.
Called and hung up after just one ring. Meant to call back and see who it was, until I saw the comment here. I will add them to my 'ignore' list. Thanks.
Spam ****. They call once, then hang up to get you to call back. Machine picks up and starts a spiel about getting a rebate. I guess the hang up part is a workaround since technically you call them.