Have done that. The problem is that this subscription opened from 2010 to now , and pricing model , including for MSDN subscriptions changes , do not remain the same.
The level of current MSDN subscription also ,the commitment model also change , offered based on discount model and not as included units as far as I understand about the new pricing offering, in other words I will follow your correct
suggestion and call Azure Billing to retrieve this information.
But I believe ,It would be a nice and very useful option the new portal, to include this info, the old one had it (Microsoft Online Services Customer Portal).
P Velachoutakos