Hey guys,
Keep in mind that end of month is crunch time for debt collectors. They have quotas to meet, and this is the time that they will pull out all the stops to get their money. They want their bonus! They will say things like, "You have until 5PM to call me back."
(Technically, if you really wanted to press the issue, they really are not supposed to deadline you unless they have a clear course of action planned...and they intend to do it. Otherwise, it's a veiled threat.