I placed a order over the phone, to buy a mini commodity, which I clearly specified and then mentioned that it was closing a position, which I thought would also alert the broker to the correct commodity. The order taker read the order back, with a very slight descripancy - omitting the mini part of the contract. I didn't catch this. Then he went ahead and bought the large size contract instead of the mini. When I caught the mistake the market had dropped close to 1K. My broker wants to now hang me with the loss, even though he agrees that I entered the order correctly he is saying that since I didn't correct the order taker I get stuck with their mistake. I need help, any advice would be appreciated.