St. Paul Stamps Inc. Interstate fraud in sale of collector stamps Branson Missouri

St. Paul Stamps Inc. sold  a set of collector stamps over the telephone to me at a price of $2800- on Oct. 1, 2013 with the claim that they would auction these stamps at the next stamp auction, where the expected increase in price would be 20%.  The first scheduled auction was March 2014, followed by auctions in August and December 2014, and additional auctions in March, August, and December 2015.  

None of these auctions resulted in a sale at or greater than $2800-.  I have repeatedly emailed and called St. Paul Stamps Inc. demanding the refund of my $2800 purchase price.  They have realized a it on my price over the two year interval in bank interest of at least 10%.  I checked the value of these stamps with a reputable collector stamp auction house in Connecticut, Kelleher Auctions, and received a valuation of only $150 for these stamps.  This indicated that St. Paul Stamps Inc. perpetrated Interstate fraud in the sale of these stamps.  I have filed  criminal complaint with the FBI on this case, as well as a complaint with the Branson Better Business Bureau in both Branson MO and Las Vegas NV,  St. Paul Stamps Inc. has not responded to my telephone calls or emails.