You've signed up for what's known as a "reporting-only" account .. fuel being "data bits processed by the act of parsing and reporting spam" ... SpamCop these days is split into two major sections ... the reporting side run by Julian, the e-mail side run by JT .... So changing the type of account is going to take some work.
1. service at admin.spamcop.net with enough detail, invoice number, etc. so that you can be identified .. and ask for a refund of whatever's left ...
2. try again at signing up, but look a bit closer at the options if a "filtered e-mail" account is what you're looking for .. money goes to another account, on the other side of the US continent. The entry page for the e-mail side of the house is at
http://mail.spamcop.net/