For reports of scammers using other people's callsigns. Remember that any callsigns listed in this forum are likely innocent bystanders (subjects of identity theft) and, thus, are probably not guilty of anything. For bad transactions with verified ham operators, use the Feedback Forum instead.
I recently posted an ad "want to buy Heathkit SB-1000. I received one reply, supposedly from K0EOB, offering to sell his amplifier. As I pursued this, it began to feel like a scam, so I found the phone number for K0OEB and talked to his wife who informed me that they had no ham gear for sale. She had received other calls of the same nature.