However, we actually do not care when you cancel the server as long as it is before the due date. We don't impose these things on resellers. The only exceptions are our Colossus servers, which are for highest application.
Our system will automatically charge your server on the due date, like any other hosting company. You have to cancel the server before the due date. We don't want to be going through the trouble of having to do refunds.
In summary: you need to let us know before the due date. That's what we require.