schoolnet wants ALOT of money

the principal summoned me into his office this morning. "will" he said. "i want you to look at this." i'm like "omg" he hands me this small brown envelope -- no postage needed -- with three giant bills from schoolnet, to the tune of N$300 each. "ugg" i said. not sure how this is going to be resolved, they haven't exactly turned off the modem service yet...