Sorry to hear about this and I hope this is just a temporary misunderstanding (maybe the seller is ill?).
Regardless, I have added a "buyer beware" notice to the top of the ad and also sent a PM to the seller requesting a response asap.
I don't know how long a dispute can be made, but would advice everyone who sent money to keep an eye on the maximum claim date.
Let's just hope the seller will react here today or tomorrow.