Difficult buyer should i just ignore now?

Hi all, sellers need advice! An international buyer started a return 3 weeks ago, and his time to ship it back is almost over. I already uploaded the international FedEx label on eBay 3 weeks ago and they have been very difficult along the way saying stuff like "you managed to buy a return label in my country?" And like asking for a partial refund once the refund was approved. When I said just send the item back, they asked, "Will the return close if I print the label?" Or "can you really not give me a partial because it doesn't work but i can send it for updating".

I already told them i sent a label please return the item lf not satisfied. Well, today he sent this: "I have the box packaged. You need to arrange pickup because it's your job to get the item back, so tell me when they will get here." Sending the item back is the buyer's responsibility. Should I even reply? How is it my job yo arrange a pick up in their country??