I bought twelve counterfiet US coins from one of your sellers: Order # 18-09814 and # 18-09814-82961. I was in the middle of trying to resolve this with your seller when all of a sudden E-bay stopped sending by my messages to the seller or forwarding a copy to my E-mail. Why ?

If they were not advertised as counterfeit, then they are not as described. You should open an Item Not As Described Return in such an instance.