Let me explain the situation im in with Stake.com,
I am a recovering gambling addict with an account at Stake due to problem gambling.
This account has been closed for a long time and they still kept spamming me with promotional and bonus emails, even though they were fully aware of my problems.
I am really sorry to hear that. Gambling addiction is a serious issue in today's world. It's very good that you are in recovery, I hope you get all the necessary help you need. A friend of mine had a similar problem, he wanted to stop gambling and kept getting emails from the casinos even after deleting his account. In the end he had to threaten them with a lawyer if they wouldn't stop.
I would also recommend you to complete close your account. It is not okay that you keep getting promotional messages on your current situation. If the customer support team is not solving the issue for you I would also write a letter to them. This is very serious and should be resolved immediately by a serious casino.