I'm sorry to hear this. However, as this is a payment related issue, I'd suggest you to get in touch with Spotify.
You may get in touch with Spotify by following this link to send an e-mail. If you send an e-mail, please check your inbox (and spam box) to check for their automatic reply. Once you get it, please reply to it immediatly (even if it's from an no-reply e-mail addres) to make sure an Spotify employee will get back to you as soon as possible.