Unfortunately, people are still receiving calls from Ecommerce Positioning. They are targeting newer businesses. They DO NOT work for or with MerchantMoms, are not affiliated in ANY WAY. Blow the whistle in their ear, or whatever seems appropriate at the moment. They are not only calling MerchantMoms clients, but other ecommerce clients as well.
What you can do: PROTECT YOUR PRIVACY - they are able to get your information from the WHOIS data; so if your privacy is not protected at your domain registrar, spend the few extra bucks to get it done.
To check your privacy, you can look up the WHOIS at sites like this: http://www.domaintools.com/
If your domain is registered here, this is a free service. I believe it is your RIGHT to have your privacy protected, and not something to be charged for.