Unfortunately, Patreon subscriptions need to be paid on the first of each month at midnight Pacific Time.
Patreon initially only offered upfront billing, and we've decided to stick with it to maintain a regular billing cycle. If you're thinking about subscribing to a new tier or plan, it's best to do it early in the month so you get the most value out of it.
To learn more about how the billing cycle works, check out this article from Patreon support: How Patreon billing works – Monthly charge upfront
Unfortunately we are unable to provide a refund if you think you were charged twice due to this billing system. For general payment issues please contact Patreon Support.