I didn’t self-exclude via GAMSTOP but it says I did. Who do I contact? I didn’t self-exclude via GAMSTOP but it says I did. Who do I contact? Contact GAMSTOP via their website here or call for free on 0800 138 6518. Lines are open seven days a week from 8am to midnight. Related articles Contact us I’m already self-excluded, will you pass my details to GAMSTOP? What's a cool-off period? Why haven't I received my withdrawal? What is GAMSTOP?