Alright as I see here, there seems to be a major disregard for problem gambling out there, I do think they do not understand how big that issue is for certain people and certain families and at the end of the day, they should have apologized and taken it more seriously. On the other hand you should have also reported the mail as spam and blocked it, but as a recovering addict I do understand that it might be hard to do that.
I do think you should seek professional help, it doesn't even have to be expensive since most of the times, the government and the insurance company would pay for it, making it easier for people to approach with. It's a serious issue and can cause long term damage, not just on your economic status but on your mental health as well.
I hope you get better soon.
This forum is all about responsible gambling, it's a community and there are people like you who have gone though a lot and have successfully taken hardest steps. Best of luck!