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. If you need any further assistance, please see our contact details here. Related articles Contact us Clearing temporary internet files and cookies in Internet Explorer Compliance Does this replace the normal self-exclusion option on a gambling site? How do I verify my account?