Wintomato is actually a casino I personally do not trust, though I can't categorically refer to them as a scam, I do not trust them due to some previous cases where some user here had some scam allegations against them, though the issues were said to have been resolved, my spirit will not just see the casino as one I am willing to use or play on.

And coming back to referrals and commission, I would suggest you read their terms and conditions regarding that area and see what they said about that, there is no way they wont have some rules and guidelines written down in their terms and conditions concerning affiliate marketing and commissions, or better still, contact their customer care to help look into your care and see what exactly is wrong and why you are not getting your deserved commission.

This is what and all I can suggest for now.