So I had this beautiful high grade ancient coin purchased from a well known dealer whose initials are FSR around 1997. I kept it in the original envelope with his handwriting and auction identification on the holder. Recently it was returned by NGC as N/G or counterfeit. I have contacted the dealer in question by email, sent photos of the coin, the holder, the NGC documents, and I explained quite politely and rationally the situation, and asked how he proposed to resolve the issue. So far I have received for a reply silence. No Reply. Rather disappointing from someone of such high professional stature. What would you propose as the next steps to take?