I have done some research into this company and here are my findings.

They have previously been flagged up by the MindTimeshare organization which deals with potential scams and they have an interesting article on them here:

http://mindtimeshare.me/2011/09/21/european-fair-trade-advisory-group-%E2%80%93-eftag-%E2%80%93-the-new-itra/

You will see that there are a number of points that expose them as a non-bona fide company.

Also the domain name they use for their email communications does not properly exist a a website so they have no 'face' with the public that one can look at and determine if what they have to offer is legitimate.

Based on the above, I would recommend you stay away from them.

As to preventing future contact that could be difficult. They could be getting your details from publicly available documents or your information may have been sold by companies and tracing the origin is difficult.

Important information: As professionals on this site, it is extremely important that our customers rate the service we provided. This only takes a few seconds. I would therefore be grateful if you could please choose one of the following options: OK Service, Good Service or Excellent Service.

If you feel the need to leave a lower rating, please reply to me first with any further questions you have. I will be happy to assist further and clarify anything you need me to. Thank you