Please note that the letter from "expo guide" is a scam.
Do not answer the survey that has hit your mailbox or will do so.
Most of all: Do not express your anger by sending faxes to the phone number that is printed on the back side (if you do want to send an angry fax to them but you already destroyed your copy of the survey, or if you want to complain that you didn't get the survey yet and you would still like to send an angry fax... send me an email, I think I still have the fax number around)
Urs