Appear legit but are not!

I got contacted about some market research in return for payment and spent 45 mins answering questions about IT service providers. I was not paid and they said there had been an error so the whole interview/research was repeated. They still failed to pay me despite many promises and eventually just faded away. This was a year ago and I was never paid. If they contact you do not waste your time as they are a very dubious organisation.