I've been completely ripped off three times (to the point of not seeing anything).
First time I told one of my friends who had a crush on me; he beat the guys ass and I got my $ back instantly (but no drugs). However, that was an extremely STUPID thing to do and don’t recommend it… as the guy then went to the cops and my friend got picked up and had to spend a couple nights in jail (the guy claimed my friend was angry that he was sleeping with his ex... can't really explain the real situation to the cops

). I was also then strongly disliked by a large group of rather intimidating drug dealers…
The second time there wasn't much to do (my friend got ripped off when he went to score H for us, came back bruised and crying) and so I just cried and kicked/threw shit.
Third and hopefully final time I got ripped off with a friend, was staying with her in an area I didn't know and she only knew a middle-man... we both threw down for some tweak and the guy ran off. It sucked but I got my $ back like a year and a half later when the guy had some religious awakening and stopped using/attempting to deal... and gave her the $.So, there’s always the possibility that things will work out for you (unlikely, but not impossible
In my opinion, there's not really much you can do but move on. I recently found out my long-term dealer has been scamming me/all the other people he sells to because his supplier got thrown in jail. The new guy he buys from charges more (and he didn't want to lose money). My reaction now is to just switch dealers and not buy from him again. I’m pissed (have lost a lot of $ to him) but not going to retaliate. It's not like you can report them to the police or come back with a receipt for an exchange or refund, and in my experience most drug-dealers are not the kindest most caring people, and not the ones you really want to start shit with if you want to be OK afterwards.
So yeah, hopefully you didn't put down too much $

. My advice: don't deal with middlemen; you will always end up getting screwed somehow unless they're a close friend. If you absolutely HAVE to, never give them money unless you know them REALLY well and let them just walk off. If I'm really desperate and have to use a middleman that’s a friend of a friend, I always offer to drive them to their connect (make it sound like I don't want them to waste gas $ and be inconvenienced) and just wait for them in the car.
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