Access Stopped but client renewed and nothing

We were on a clients site because they had a 30 day free trial. We set up the site and wanted them to pay for the service before the trial was up because it was ready to launch. In order to do this we had to stop the supporter status so that they could pay through the website.

They paid through the website but now the site is not automatically coming back on?

Questions:
Why isn't it automatically coming back on?
If someone is ready to start before the free trial is up, what's the best way to do that?
If you stop a site from gaining supporter privileges, do you have to manually renew them every time?

Thanks in advance!

-Jonathan