Real-time voice or video communication between users on mobile devices or computers
Your Skype account is not blocked because you are still able to login with this account to Skype Dial Pad site, but the call might be blocked.
My guess is that this is due to the fact that all Skype calls are now anonymous. Microsoft has last year disabled Caller ID on Skype. Recipients might block anonymous (private) calls.
Have you tried to make calls to different phone numbers?