1. The first thing you can do whenever you have a concern related to Skype is to check the Skype website’s Support page. There is a organized database there of frequently asked question and concern. You can also use the Search box to find topics related to your question or concern.
2. You can also send a message to their Email Support team, especially if your concern involves specific or sensetive matters related to your account. Just visit https://support.skype.com/support_selection (requires login), and provide the support team a detailed description of your concern. The customer service response time varies from a couple of a hours to a few days (usually within 4 days).
3. Visit the Skype Community Forum. Although this is not an official support channel of Skype, there are a lot of users and experts who could assist you with your concerns. The community forum’s URL is http://forum.skype.com.
*Skype also offers live chat Support, but this service is available for Premium Users only.