Is it possible to track Visacoin and force him to refund scammed investors?
No, Of course not!
There are probability 50 investors from 50 different countries and Visa Coin enjoys his money in china.
Honestly, this guy strictly hasn't violate the law. There is certainly no rule which forbids a stupid business idea and stupid investors, which believe in this stupid idea.
It has to be acknowledged, that this guy can sell the pure shit for gold. Perhaps he would be a good insurance agent or a used-vehicle dealer.