Reconfigure manually extended Pro-Site

Awhile back, I had a site whose Pro-Sites status had cancelled--even though his payments were being collected on a monthly basis by Stripe. In an attempt to restore service to this site, I manually extended their access.

Since then, I have been unable to re-connect them to Stripe. I have cancelled their subscription through Stripe, refunded their payment, and cancelled their subscription through Pro-Sites. I then had the user log on, and go through the subscription process again, entering their credit card. They were given an error that since their account was manually extended, it likely would not renew correctly.

I am stuck--I need to somehow undo the mistake I made with the manual extension, and revert the user to auto-renew, as payments are made through Stripe. Is this something you can help with?

Thank you!