You can request online server support service directly from the Plesk control panel.
To do that, click the SUPPORT button on the Server administration page.
You will be taken to the Online Server Support form at the Plesk product web-site. Fill out the form and enter all the information required. Click Submit Request. Your request will be encrypted and delivered to Plesk product support staff.
It is highly important to make sure that you provided all the information required, otherwise the form will not be accepted. The request will be assigned a unique request identification number that is generated for your request to be addressed and will be valid until your issue is solved.