I'd imagine it being shut was the reason they couldn't give you a paper ticket, I just found it odd that you went to the ticket office when you'd already phoned and was told it was shut? The ticket office in the shop is the ticket office and would have been the same people you would have spoken to on the phone if open, the one in the ground is only for match days. In todays digital age I cant imagine many people use the ticket office outside of match days?
Sounds like a ballache to go home - I'd be going to the ticket office and picking a paper ticket rather than do that, the queue wont be bad on Monday its the cup games when they are bad. If it helps you I could print it off and meet you.