Hi thanks for the reply
In my case I found out that the buyer complained that I had scammed him by taking his money and giving him nothing. Now I will have to prove my innocense to the bank by going to the branch with all the evidence that he did in fact receive bitcoin in return for his payment
If you are a victim of man-in-the-middle attack, then tough luck. You will have to show evidence that the bitcoins were indeed sent to him, and not to anybody else.