Just had a read of this thread for the first time and to be honest, if you are willing to hand over £1000 or more for a round that you have never seen or surveyed, never been introduced to the customers of, and in essence never fully quantified what you were buying, then I am sorry to say it but you have only got yourself to blame.
I hope you do get sorted out with this person, but to be honest I wouldn't hold my breath.
Best of luck and if nothing else we should all learn by your mistakes and misfortune.
I have only ever bought one round, similar in size to yours, but I went round every house with the lad, introduced myself to all the customers and knew exactly what I was buying into before parting with the money.