Ustad first, the desk second
Ustad answers instantly, free, without a sign-in, and it has the register behind it. For anything the record already knows, which is most questions about a vehicle, a price, a dealer or an auction, it is simply faster than waiting for a person.
Go to the desk when the answer needs a human decision or a look at your own account: a listing that will not publish, a claim that was refused, a figure you believe is wrong, money, or anything where you need someone to take responsibility for the answer.
The two are not separate desks. The person answering your card has Ustad and the register open beside them, and an answer they give that others will need becomes a page in this manual.