Client's funds are being held on separate account and they are not part of SimpleFX's assets, so in case of a default your funds are safe. Also you are always protected by your local law and St. Vincent and Grenadines law, where SimpleFX is registered. You can always assert your rights in court because SimpleFX is officially registered company and is operating within the rules of law.
That's the issue with unregulated brokerages. When a client runs into issues with a regulated firm, they file a complaint with the regulator. Deposit insurance often also applies (like in the UK). In your case, the only option would be costly and lengthy legal proceedings in distant St. Vincent and the Grenadines in hopes your segregated accounts are also held there (are they?) and the funds are still in them.