Yes, very frustrating.
I like the work from MSI and they pay quickly, just hate the waiting.
I usually put time requirements in the shop request but that does't seem to matter, they usually don't respond in time for same day shops.
They never did answer me so I finally just cancelled the messages/help request but the shop request itself has no way for me to cancel that so they will probably assign it and I will have to refuse it ... grr.