I found
this thread from several years back that seems to indicate that, at least at the time, the site you mention was not a scam.
However, disconnected, free, VoIP phone numbers are always a red flag, and the site appears to be in something of a state of disrepair (broken images, etc.), so I wouldn't be entirely surprised to learn that the domain has been taken over by a scammer or simply abandoned (but still collecting money).
Of course, if you still can't get anywhere, I'd go ahead and file a chargeback request with your credit card issuer indicating that you never received the service you paid for. In any case, good luck!
