A customer ordered a Sports Illustrated and I inadvertently sent the wrong cover. I immediately refunded in full and told him to keep what he received as my gift. I even intended to send the correct cover free of charge notwithstanding his libelous and false negative feedback. In the interim, he messaged that I am a “scum bag” and he hopes my children won’t become scum bags too. I asked Seller Support to please block him. He has now messaged demanding his free magazine and calling me a “- - - - - - - C—T”. The C- - T was fully spelled out. Any advice is most appreciated.