Gold Meritorious Patron
Welcome to the board Emily,
Just call and ask the treasury department how much money you have on account. If they ask why, just say you're thinking about doing a service and that you need to know how much money you'll need to come up with, if any, based on your account balance. Then request that they mail you a statement, so that you have the proof of what they told you.
I understand the anxiety of calling. I'm surprised you haven't been getting statements all along. Just play the game. A few minutes of anxiety to get the balance so that you can thus get a repayment is worth the repayment amount.
This is a good plan.
If they won't send you one, then send them a letter by registered mail requesting an up-to-date statement of your account within 7 days.
If they still don't comply, then get legal advice and report them to every relevant government agency that you can think of.
If it is your money, they have to provide you with this info.