How can you speak to a live person from DCAS.

You can't unless you have a direct phone number to a DCAS employee. The best way to speak to a real person is to visit DCAS in person at 1 Centre Street. But you need to know which floor to visit. For example, the 14th floor has a customer service person who will assist you with civil service exam information. DCAS prefers to contact the public by mail because decisions are made in writing (rather than in person or by phone) such as granting you a city job or not.

Yes you can call dcas its available online.