To the OP,
Not that this is going to make you feel much better, but just know that you are not the only person in this same boat. I don't know who your vendor is, but I have two vendors from the forums that have had much larger chunks of my money for multiple months now, in one case, since September of last year. And a third vendor that isn't a part of these forums who keeps breaking promises to me as well.
It's very frustrating... I don't particularly want to come out and bash anyone either, but I also think that people considering a purchase (in some cases, rather large purchases) should be aware that things don't always go smoothly or on schedules that are promised. I'm very aggravated at having to keep track of all the details of each of my orders and needing to chase down the vendors to make sure I get everything I'm owed...
At this point, I do expect that I will be getting everything that I've ordered. But I also expect more phone calls/emails along the way before I get it all. One vendor actually asked me today what I am still expecting from them. Hmm, at least half of the order that I placed and paid for back in December! I got the impression that they had no real method of tracking what has and has not shipped, and that didn't instill a lot of confidence in me...
I would be much happier if the vendors would communicate and just be honest about what's happening along the way. I'm much more tolerant of delays if I'm told what's happening via proactive communication rather than hearing excuses when I am having to initiate the conversations.
Anyway, good luck, and I hope this is resolved quickly for you...