SIr
The seller needs a credit for the eBay fees he has to pay for your purchase. As the deal wasnt over. No matter for what reason.
Its not being rude. But its a necessity or the seller will end up paying unnecessary comission to ebay.
Had the communication been better you could have informed the seller about the problems and the deal could have been over by mutual agreement.
however knowing all the processes and policies is difficult. Its so vast that you end up studying it more than you ever studied in high school ..lol
Contact the seller and ask him to reverse the FVF (that will happen after you make the payment)
Cheers...
TechiE