My Monex account representative did not follow my instructions and he did not advise me that I purchased of a gold bullion. I had specifically asked for several quotes for all the different gold and silver coins, and a quote on his commission, and the shipping charges, and of course the amount for the margin call. I had never freely agreed to any purchase on that day. But they have a tape from their "trade" line that I said "yes" to a "GBV" and he never advised me that I made a purchase. Now I have a loss of $600 for the difference in the buy and sell price because they considered this as a default according to the account agreement. What should I do to get my money back?