caller called but did not say anything

caller never leaves mesage or respond

called but no message

Received & ignored call on my cell; any number with central office number of 000 seems hinky to me.  Caller left no voice mail.  
Attempt to call the number gave me a cell provider's error response to an invalid call.

As soon as I picked up, it began a pre-recorded message about my business's credit card processing, saying "Currently there is nothing wrong with your account." Well, I hope not, because we have no credit card processing accounts whatsoever. Nice robocall fail.