If you have something to be done that has a tight deadline on it, particularly when that thing that needs doing is the last thing that is required by you, because you are moving to a new supplier, then paying your bills on time would help achieve this.
I told him start of the month we'd be happy to help with moving his domains as long as he paid the bill that had been sent some time ago and was already overdue. He didn't pay it. Then he emailled yesterday afternoon saying'can this be done yesterday!!!'. No, actually it can't. It can be done when you don't owe us £253 odd quid, and not before!