you need to contact the Skype customer service. Just click the link below, and click the email support button. Choose subjects Security & Privacy >> Identity theft / Account takeover.
https://support.skype.com/support_request
Moreover, you can visit the link below for suggestions on how protect your account and prevent similar incidents from happening in the future;
http://www.skype.com/intl/en/security/online-safety/
moreover, please remove your email address from your initial post. this is a public forum site, and anyone, including potential scammer or spammers can view and obtain your email address.
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