I was scammed by Octaex as well. I attempted to withdraw about $100 in BTC to my wallet (Triple checked the address) and after 48 hours, about 1/3 of the amount I requested was sent TO A COMPLETELY DIFFERENT ADDRESS. When I say 'completely different', I don't mean that I made a typo with my address. I mean that it resembled nothing of my address.
I'm glad my first trade with them was for a small amount, as it will be my last.
OctaEx.com is a scam.