You’re at the mercy of the dealer, it takes them a few minutes to cancel your order but they’ll do it when they want.
Once they have cancelled the order it should reflect on your MB online account almost immediately.
Keep checking your account, once it has gone off you can reorder straight away.
If the dealer drags their heels pester them until it’s done.
If I seem a little strange, that's because I am.
Skoda Karoq SEL.