Tacequip Goss and Goss Forgot to ship, trying to charge for fed ex label printed, but not scanned. Hickory North Carolina

Purchased firearm with Visa, owner "forgot" to ship from his home for about 5 days, while giving me info about shipment to another state. Asked for refund. Wants to keep 3%Visa charge and charge for Fed Ex shipping label generated but not yet scanned. Called Fed Ex and was told they do not charge until it is scanned.  Also 65.00 charge (3%) for using my Visa. Called Visa, was told they do not charge to use card, that my bank might. Called my bank and was told they do not charge, but his bank might and he might be pushing his banks fee to me. All I want is charge removed from my Visa for.