As someone who isn't from Canada i don't even pretend i would know enough facts to give legal advice, but if you can't get any more info from them, i would start by filing a complaint to
Curacao's Egamin just to get the ball rolling.
I am not asking how much they owe you and i wouldn't recommend telling anyone, but if it's enough you should definitely hire a lawyer from Canada (if you indeed are a resident there), that specializes in something like this. For all you know you could be doing all the wrong things and shuffle could threat to sue you back for defamation.