I've found the Facebook for Business support to be hit or miss. For billing questions they're timely and helpful. For complex questions about specific services I've often received a longer wait and a less helpful experience. I'm often redirected to their docs, which are often not particularly helpful.
I've had good experiences once I actually connect with a representative, but the initial ticketing process is very slow. I don't have status updates on where my support requests are in the queue, either.