I have recently been contacted by the RedZee multiple times. (Wish they would check out the do not call registry!)
Anyway, the whole thing is a scam. They show you how amazing they are with their paid listings and dont tell you that in order for their automatic top placement listings the end user must have spyware on their computer. Not only that, but the numbers they use in their pitch are WAY off. They state there are millions of users who have their product installed and that you will get tons of traffic. Its a bunch of baloney! Anyway, I will be keeping my google adwords and Yahoo! accounts going and not bother with their garbage.
As a side note, if you have been called by them, please file a complaint at the do not call registry. They seem to be preying on real estate agents lately.
https://www.donotcall.gov/default.aspx https://www.donotcall.gov/default.aspx