Here's the relevant PayPal page: https://www.paypal.com/sm/smarthelp/article/how-do-i-cancel-a-recurring-payment,-subscription,-or-automatic-billing-agreement-i-have-with-a-merchant-faq1067
They want you to:
1. Contact Fizzer (you can email him at firstname.lastname@example.org) to cancel the subscription
2. If #1 doesn't work, they want you to contact PayPal customer support
Sounds like you should follow the steps for #2 now. If that doesn't work, you can use the bug report as a backdoor to contact Fizzer (https://www.warzone.com/ReportBug
- this just creates a DM between you and Fizzer) or work with your credit card to request a chargeback for your next monthly payment.
You can also request that someone else with a higher-level account create a group DM with you and Fizzer. Another way to get Fizzer to respond to you is to leave a comment on the Warzone Blog; he always reads those.