You have probably bought off a re seller. Not an actual server.
Basically, somebody who goes to a server and bulk buys lines at a discount
and sells them on.
So, as most servers won't supply lines for that long he may well
have just bought a line from a server for 1 or 3 months, if he doesn't pay to extend your
line with the server then that's when it goes off.
So in the short term the feed back will be good as people think they are getting what they have paid for.
You may be a lucky one but plenty aren't.