First cancel the subscription on your account on the Skype website. Then, you may reach out to Skype Customer Service to apply for a refund; here is a link to start with: request a refund
If a suggested idea resolves your question, please click on the "Accept as Solution" button so everyone else will see what works!
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-> Good reads: Devise good passwords and stop password attacks
and this one, too: http://www.rd.com/slideshows/internet-security-how-not-to-get-hacked/