You definitely have a case here by the look of it. Please update us once Videoslots get back to you. They’ll go back to the provider on this one to verify what happened, so it may take a bit longer than usual.
When things like this have happened in the past, I have seen them refunded, so stay positive! What’s weird about this case, however, is that it wasn’t cancelled, and they actually took the money from you. Feel like someone messed up here.