First time hearing about these kinds of online loan companies in Sri Lanka, Really sorry for what happened to you and appreciate your effort to make awareness about this issue to others!

I checked their site, as you said they don't have multilingual languages options, also there are no proper details about how they are costing their interest rate (interest rate is very high) and seems like there is no proper process or documentation to get the loan. TBH if I see these kinds of sites I will never take a loan from it. In the above explanation it's clear that not only fraud they also verbally abused you. Can't you take legal action against them? in case if you have proper evidence against them.