SheIn Online investment

I started an online investment with SheIn where I have been speaking to one of their members or trusted Independent broker. The first 2 transactions I did where processed with less hassle including commission which I thought was great. The next step was when I deposited a R2500 into SheIn business account which required me to make a some few orders. The last order was not processed because it needed me to deposit another R6800 into the account which I don't have. As we spoke on Telegram with the broker that I can't raise that extra cash on top of what I had deposited, the tune then changed to a scenario where I'm told I must borrow to fulfill this order. I advised that as a beginner I don't have that extra cash and pleaded with her to change to a lower option which all went wrong as she froze my account and told me I can't access the deposit I made already. This left me shattered honestly because as new online investors such things are bound to happen where we make errors. My question is why SheIn does not refund you your money or at least offer a lower option for such mistakes? Why was I asked to pay another R6800 when I initially indicated I'm investing only what I can afford? Is this how business should be done or it's meant to entice you into depositing bigger amounts then the account is frozen. I really need my cash back because this is very suspicious to me. A true genuine business will show you the ropes and and also explain the process in detail before making people believe it's a good online investment. I really need to understand the process here and more so just get my cash back because the idea of investment is to invest what you have and make small returns on it not asking for more money beyond clients affordability