Hi Matt and Shane, thanks for your replies. Indeed there is something fishy. I have been using their service, defined some keywords and they seem to rank me up. I mean they charge if you get a rank between 1 to 10. The fee depends on your ranking for those keywords.
But when I ask them to show me what is the work they are doing. They just say the following:
_"Thank you for your email. We provide the summary status report under the recent activities area, however we don't provide the specifics given our Performance-based Business Model. We originally launched by providing customers with every tactic within their custom program, and then we unfortunately had customers exit the service and simply utilize the plan that we spent time developing. _
We evolved our model a few years ago to strictly performance-based pricing based on our responsibility to deliver results, and we understand this approach will not be for every customer, however we'd love to demonstrate our effectiveness for you, and appreciate the opportunity."
I did some research and found very weird posts mentioning our website in Google+, forums, twitter, etc. They were just a few, but the problem is that they mention our web with a bunch of non-related and spammy texts. Maybe that is the work they do.
I think, will move out of this type of services. They may make a difference on your ranking but at the end the website gets a bad image with strange social postings.
Thanks again for your help and comments!