The buyer and I agreed for pick up and payment when picking up the cell phone because I was flying out to a family funeral that afternoon. I left cell phone in agreed place, I checked several times and text the buyer to remind them that I would be leaving to catch my flight. When I went to check agreed pick up point the cell phone was gone and payment not left. I have messaged and called several times but no reply. I saw on their account feedback that they were ok traders hence I trusted I would be paid. I have placed feedback on their account but no reply what can I do ?