Call them back. Weekend (and holiday service) is ridiculously expensive and costs more than $300 just for service (not including passport fee).I called them early this morning, they said that the local office will call me to book and appointment. But they have not called me so far, its been 3 hours past the time they said they will call me. And with the weekend and my travel is Tuesday. I don;t know when would they call if ever.
You should be able to get passport same day as well if applied on Monday but better to not leave it till last minute. I remember that someone who walked in with confirmed ticket was given urgent service (without appointment) as they were travelling next day. Walk in is worth a try if it's not possible to get an appointment today.
Good luck.