Just as an update, my complaint has been deemed as "unresolved" by CasinoGuru as well, given that Rollbit refuse to budge or provide any reasonable explanation on stealing client's winnings.

I would caution anyone thinking of using the site to think twice, as they can confiscate all your winnings without further explanation.

Would also like to ask for any advice to move forward with this, is issuing a complaint directly with the regulator the only option?