United States Trademark Registration Office Deceptive solicitation designed to look like bill from US Patent and Trademark Office Los Angeles, California

I own a trademark, and received a solicitation requesting a processing fee of $375.  It's obvious that it was intentionally designed to look like a bill from the US Patent and Trademark Office.  The address is the "UNITED STATES TRADEMARK REGISTRATION OFFICE" but in the very fine, light-gray print on the back it does state that it's a private company, and it's merely a services that adds your trademark to a US Customs and Border Protection database.  The solicitation had no phone number or mailing address.

I did a google search on the mailing address and it's a company called Davinci Virtual Office Solutions that offers an answering services and forwarding services from impressive-sounding mailing address for a fee:http://www.davincivirtual.com/

I called this company at the phone number on their web site (888-863-3423) and complained that they have a client engaged in very deceptive marketing practices (at best).  I encourage anyone else who has received one of these solicitations do the same!