Ok, after doing some digging, I came up with a list of different phone numbers that you can contact if you need support or questinos answered from Yahoo. I know there are other threads with the customer service number listed but I figure it might be easier to put them all together in one thread. So here they are:

408-349-1572 Customer Care (call this for any question, they can direct you to
the appropriate # as well)
408-349-3300 Media Relations (has a lot of Yahoo divisions listed to connect
to)
408-349-5151 Billing customer Service
415-345-4793 Yahoo Press release line (for members of the Press only)
866-800-8092 Small business customer service (tech support, billing, sales,
cancellation, etc..)

I think that should do it. If you can't find the # you need here, call the first number on the list and ask for assistance there.