I know its an old thread, still I would like to share my experience with FXN.
I had the same issue, I started with interactive-option, though Im not familiar with option trading, I wanted to withdraw my balance.
That time they offered my Forex trading account with FXN Trade and transfered the balance to FXN account. I noticed that it was not regulated, but when I ask then about it, they told me over phone it is a subsidiary of interactive option which is regulated with Cysec.
Later when my account was around 12000$ , I had some urgent financial requirement and I tried to withdraw, but no answer for calls emails.
I went Cysec website and made a complaint against interactiveoption, then people from interactive called me to claim that they don't have any relation with FXN, they were speaking like they never heard of FXN. After a lot of negotiations they agreed to pay 2000$ which I was deposited directly to interactiveoption account, rest was deposited to FXN. I had to accept 2000 thinking 'something is better than nothing'..
So my advice is to make a complain with Cysec again interactiveoption, as you have proof that all deposited were gone to interactiveoption, and better you don't take the name FXN to avoid issues.