I doubt it's a scam but who knows how business is. Could be lots of reasons that just amount to bad customer service. Not like that is rare.
I once had a problem with a software tool author because my ISP was 'spam filtering' the email he sent me in response. Had to use a online webmail setup so i could get his email with the registration info. Maybe try a different mail account if something like this is at all possible.
Here's the registration info for the domain, there is some more contact info here that you might be able to pursue.
http://www.whois.net/whois/livedrive.com.comUnfortunately if you cannot get a response there may be little else that can be done. I hope that you do not need to access your data to recover anything that is lost.