There is also no way of knowing whether or not the agreement says that the payments will be paid every month, with a disclosure that says this is what will be paid monthly and it makes all the sense in the world especially if the deadline is indeed March 31, 2013. Like you said the payment is equal to almost 2 payments.
What you see as a lack of information, myself and others might see as an open end agreement with the final payment being received by March 31, 2013. As long as PWC receives their payment by March 31 the point is mute. It may well have been agreed upon by HLNT and not PWC that HLNT would make 3 payments, with the first month being a grace period. I mean we all are familiar with that aren't we?
So what's the issue again?