Trying to cancel premium service, 404 errors

Trying to cancel my $99 premium service, the option to cancel just came available TODAY - when I click 'yes, cancel' I get a 404 error so I go back to manage services at the $99 premium service is STILL showing as active :( How can I cancel the service? I am due to be charged within a day or two and I just NOW had the option to cancel because of the 90 day thing...I've already emailed TWICE about the issue (since Monday) and have not received a response.
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