If you go to the bottom of this page and click on the list of mystery company, you'll get a list of verified actual real mystery shopping companies. If you sign up for the first "most talked about" companies (there's 15 or so), you should start seeing shops in your area.
Also, read the "new shoppers" forum, especially the "sticky threads" at the top.
Please give details on how you were scammed -- it's vital, so we all know what to watch out for, especially new shoppers.
And welcome to the forum!