Signature automatically renewed

[Rawrz]

Go here after you log into the mog station, https://secure.square-enix.com/account/app/svc/acctop
(You may have to click Select Service on the left hand side if you hadn't already logged in.)

Click FFXIV then Manage Service Options.

Then just hit cancel subscription. :O

That should do it for you, although you'll have to contact customer service to ask if they could restore your crysta for the accidental payment. I don't know if they will, but give it a shot!