Yup, sounds familiar to me. Ive once sent alot more than that for a bulk order. But at that time they were on top of the world dominating the x11 market.
They recieved my payment late, a few days late to be exact, issue was on their side. They told me they can not honor the quantity i paid for. But they will try their best and hope i get lucky if they have enough stock.
I told them to go fuk off and just send my funds back. Done. Never will support this company again. Even if they were selling real live unicorns.