いま試しにまだ受け取り確認してない分でOpen Dispute選んでみたけど
最初にRefund OnlyかReturn Goods選べるようになってるんで

説明で
Refund Only
- I haven't received my order and I would like to get my money back OR
- The product is not as described and I would like a partial refund.

Return Goods
- I am not satisfied with the product I received and would like to return
it for a full refund. You may have to pay the shipping fee(s).

Refund Onlyは部分返金だってなってるけど
こっち選んで全額指定したらいいだけだよ
これでこないだ全額返金して貰ってるし