just to be clear, tc has issued a cpl? or the school won't sign off on your cpl, or release your ptr until you pay monies owed?
either way, they cannot retain your logbook, it's your property... if tc has already issued the license just call them and complain that the school won't release your documents and let them follow it up or issue you a new license.
if you do still owe the school money, maybe pay?