There’s nothing you can do, you’ve shared a “ weakness “ in there eyes and morally they have reacted appropriately to your “ over playing” statement …
over reaction to your message? yes , heavy handed? Totally,
but like I said from their point of view you wanted to shut an account because of over playing, shutting an account is seen as a bigger thing than time outs or breaks , your request in their eyes is a sign of admittance of problems and they are trying to save you and them from getting in the shit…sadly no complaining or letters will change this now, you’ll have to ride the 5 years as the bans (in my knowledge )can’t be undone and the casino won’t budge on it …