Help unsubscribing from Debian mailing lists

Apologies if this is not the right place to ask. My email address is "myname@gmail.com", but I subscribed (to several Debian mailing lists ) with the email "myname+web@gmail.com" (I'm 99% sure). I think because of the "+ trick", the system fail to unsubscribe me. I've tried the unsubscription forms and the alternative methods but nothing worked. I didn't find an email contact to write to either. What should I do?