The OP is actually the one being rude here. Telling the owner feel about being scammed after a clear explanation on how the casino rules works towards situation. In most of cases, He will just be banned to use the chat if this happened on casino live support.
Reading the reply of the owner means there’s already a lot of explanation before this snip conversation about OP case. Stating the facts the hard way is not rude if the customer doesn’t want to comprehend what you are saying or read the ToS as reference for the support explanation.
The OP is being angry for nothing here.
I know the OP is rude, and yeah, the support might be stating facts but being in a customer support service, they should be more in control of their emotion and show professionalism towards their gamblers, they have an image to protect and what the support told OP could be viewed as being rude towards customers and it can be bad for them.