I recently had a load of companies apparently wanting my opinion of their products - some of them expensive phones, TVs with enormous screens and the like. So keen were they for my views they were happy to give me one to try and keep!
Sadly, a look at the email addresses from whence they came showed they were nothing whatever to do with the company offering me these gifts! Clearly a scam and I ignored them all. after about a week or two they stopped. I think it is important never to respond to these things, as this tells them you exist and they can then try another wheeze which might just work.