I'm a new patron :
Can Patreon charges me the pledge (money) in the joining?
Never, Patreon charges the money during the first week of each month (only if you are my patron after I submit the “paid post”, which I publish the last week of each month).
But Patreon charged me without my permission, automatically.
If you have an issue with your payment via Patreon, you have to contact with the Patreon support. I don't understand how they charged you if, like I said before, Patreon doesn't charge anybody until I publish a payment post (and then we have to wait until the first week of the next month). If they charged you in some way, you must to contact with them to solve the problem, because I didn't recieve any payment and I don't have "power" to help you, note that I'm just other “user” like you in this website.