My advice would be to contact the user, if you haven't already, to find out what's going on.
Changing the password for now would be a pretty good idea. It's after the prearranged time frame so there's nothing wrong with doing so.
If you've payed for a level service and it wasn't done, that's a scam.
Read the stickies and then post in the Scammer Accusation section with as much evidence as you can:
http://forums.d2jsp.org/forum.php?f=250