Searching all the time, but forget to pay mysterious clients for that they always need others. A company that only sees own interest and the employees doesn't matter for them "Forget" to pay visits, pay very little on the visit, often below the cost you are forced to do. Do not approve in abusive mode visits, as they only decide, what is not worth being a mysterious customer for them. I was a few years old, but after they "threatened" me to close my account, I decided to do it myself after the last money I had.
So my advice is to focus on other mysterious shopping companies because 4services are not worth it.