1. I'm not sure what's meant when you say you want to "get it back". I mean, it's not the same thing as someone breaking into your house and stealing your TV and you wanting it back. Anyway, consult your credit card company immediately and tell them to cancel the current card and to issue you a new one. I'm sure you did this...just checking.
2. Now the technical stuff: How do you connect to your email and your Xbox account? Is it using a wireless router?