Sorry to hear this, when you say vanished, do you mean *piff poff poof* proper magician + cape + cloud of smoke stylee or have you exhausted all the contact options like phoning them directly.
The reason I ask this is that often when a couple lose contact with a supplier it's via email and facebook only. But nobody ever tries to phone them.
You probably have, but just wanted to check, because it happens a lot on this forum and it's hard to ignore a phone call.
But... these people are available on your date and are aware of your budget.
Hope that helps and that you get it sorted x