Failure to communicate

(again). Company Ks classes resumed last week, but apparently there was a breakdown in communication in our office (not a real surprise). Old Secretary told me that there was a problem we needed to discuss, and heres how the conversation went:

Old Secretary: You were paid for an extra lesson for your Monday company K class.
MrT: What?
OS: The lesson last on Monday was one more then they had paid for on their contract.
MrT: Its part of the new contract.
OS: New contract? I dont have any record of a new contract.
MrT: Ask Bossman about it.
OS: Oh.

Apparently Bossman hadnt told OS about it, even though shes the secretary responsible for both payroll and billing.