I have a question about conflicting guidelines or something that materially affects the assignment. I email the scheduler. Crickets. I email again the next day. Crickets. I email a third time, include a request for an extension because now I'm nearing the due date. Crickets. The day AFTER it was due, I get a reply that gives no answers, just asks if I did the shop.
Often there are phonecalls to "full" voicemails and text messages unanswered as well.
Having been burned one time too many by the wrong "guess" I refuse to shop without clarification when it's a major discrepancy.
And don't get me started on merchandising assignments where I never received the pop/irc/whatever!!