Maxcell Pty Ltd - Unfair treatment and misleading website

I subscribed for online work on their website, where an order is allocated, you make a purchase and a commission is paid back. I was able to carry out successfully, 2 transactions. On the third one, after paying for an indicated order, suddenly I am notified of a double order, of which you are not made even to choose whether you accept it. Now for me to be paid, I need to make the second order, on top of the first one, for which I must now pay funds I don't have.
Importantly, you are not made aware of this double order condition, before paying for the first one.