This is turning into one of the ubiquitous "those" kind of days, for reasons both various and sundry. But I will not bore you with all of that. Instead, I am going to bore you with the idiot that just called the billing office.
Consider this a life lesson that you may apply to your own existence. If you get a bill and call the number on said bill, and a person answers "Billing Office", that person works in an office where many different accounts are handled. If that person takes your information and then tells you that they are not the person who handles the billing for that particular office and offers to put you in the voice mail of the person who DOES handle that particular office because they are on the other line, DO NOT ASK THE PERSON YOU ARE SPEAKING TO IF THE OTHER PERSON IS GOING TO CALL YOU BACK! The person offering to transfer you has no power or authority to coerce the other person to call you back. If they did, they wouldn't be the schmuck fielding the call in the first place. That is the law of Natural Selection - Cubicle Style. And by asking the person that question you are begging them to go to the person you ACTUALLY need to speak to and tell them that some asshat (or whatever designation is used in that particular office) is on their voicemail, but since they are in fact an asshat, take your time getting back to them. Maybe get to them on Thursday.
Because we are bitter, bitter people with nothing else to amuse us while we are here other than to take vicarious shots at you and to prioritize our work day in ascending order of what annoys us.