It's a violation of your ICA and the forums to mention the client and the MSC in the same post. Since a whole bunch of clients have been listed here, we can't tell you which MSC has which client.
I know that's why I only asked for the MSC's, and got responses for the clients..Can I create or ask in another post? I've been looking on and off for years.
Google the store and add Mystery Shopper. That will give you a list of companies and mystery shop companies they use. MSC's have the information online.