Please let me clarify my issue more. I have created a new account after recieving those mails, since the first account was already excluded. I have let them know about the issue and asked them for a refund. As they were fully aware I am a problem gambler they immediately locked the new account to, however I managed to lose some money on that account.
I want to blame you for doing that. Try to have a control over yourself. Stake has done the mistake by sending you promotional messages after your self-ban request. But they aren't responsible for the losses in your new account. You had the option to unsubscribe their promotional message (some forum members has mentioned it above), but you haven't done it.
What a casino can do if you create a new account after requesting self-ban from your old account? They have nothing to do until they recognise you by the IP address. And it takes time to complete the process. You should block gambling sites URL from your device.
I can understand your point of view, however thats not how every person works. A casino has failed in their responsibility to protect a problem gambler. Also who knows to how many people they are doing this. If casino makes a mistake they should rectify that mistake. Last month there was a case with a casino I won't name here that has done the same thing, however they only accidently send emails to excluded members for sending out just one email, they are facing some serious legal action.