I "accidentally" signed up for ShadowShopper several years ago. That's how I got started in MSing. I was so angry that they got my $99 that I vowed I would make it back and then quit! Well I made the $$ back and I'm still shopping 7 years later.
My suggestion is that you:
1) make sure you are NOT signed up for automatic renewal!
2) go to the section that says 'shopper education' and start signing up and emailing EVERY company that you can to make sure you are getting the jobs directly from the companies themselves. I actually took the time to print out every page of that directory so that I could have it as a resource and checklist for myself.
Unfortunately, you've already spent the $$ so get as much out of it as you can!!! Also, every time they send me an email and say how much they miss me and want me back for $3.95, I sign up just for that month so I can find out if there are any new companies added to the directory. I also get lots of emails and employer requests that I normally would not have gotten on my own or anywhere else.