You have a better chance between 6PM to 9AM. By Pressing 5 to speak with dispatch rather than appointment clerk to get transferred. But even the drivers have the same issue. They get through with cellphone contact.
Listen to the prompts then press the1 for dispatch they will get you who you need
Hit zero when the recording comes on
They are horrible at answering the phone, all I can say is to keep trying or go there personally
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