Agreed that you are probably asking in the wrong place if you are looking for "deviant customers". Clicked to read the preamble and I don't understand the following part:

Are there any benefits to me if I am in this study?

The potential benefits to you for taking part in this study are managers can learn how to better deal with deviant customers, thus limiting your exposure to them.

If you are only interested in surveying people who have acted deviantly, why is it a benefit to the person surveyed that managers learn how to better deal with them? That's a benefit for the organisation, not the deviant customer! Am I missing something here