TOPIC: Copier clicks

Recently our Xerox 5400 had a ridiculous meter reading. The black prints registered as nil one month, and the following month the colour prints registered far too many. Over all the over and under amounts were almost the same,(around 11,500) but I have been told there are two other check meters which make the whole system totally error free and I just have to pay.
This is a big worry, because not only do I have to pay $1150 for colour prints we have not done, we do not know what has caused it.
Fuji have tried to hekp us but the firm we have the contract with are not budging.
Has anybody had a similar experience?