Yes, I found phone calls to the LTR unit to be invaluable, also in-person visits when all else failed. If you call, be prepared for long wait times, so have something to do or read while you wait. You'll probably first get the BOI switchboard and get put on hold. Ask for the LTR unit, and you'll probably get put on hold again. But once you get someone at the LTR unit, they'll be able to look up your case by the "DOC number" which if it's a digital work permit that you applied for this year, starts out "LTRDWP2401..." Hope it goes well and you get your appointment!