Black platform

I signed up with a friend, deposited 250u, and made a profit of 1000u. I clicked to withdraw and the platform wouldn't give it out, saying that there was a problem with our account that needed to be reviewed for 3 to 4 weeks. The final result says we arbitrage. I asked for proof of arbitrage and they were unable to provide it. I have to wait 3-4 weeks for a manual refund of my principal. The principal has not been returned yet.