ST PAUL STAMPS They told me they would sell my stamps branson mo

I was contacteded by this company and was sold a few stamps. I kept getting calls to buy more and told them I wanted to try to sell the ones I had bought. They kept telling me that they would sell them at the next show but there was always an excuse. Now they will not answer the phone. They have never responded to emails. They are holding the stamps I had bought and based on others that are citing their purchases as worthless I am assuming I was sold stamps that were worthless too. I just want my money back.