条件をのむべきか...

eBayで落札後、物が一ヶ月経っても届きません。
セーラーさんに質問したところ、下記の返事が来ました。

I am really sorry for the problems we are having with your package!! I have spoken with royal mail today and they have confirmed that i cant file a complaint to look for the item until 13th August as they have a 25 working day delivery policy - then i can file a missing mail complaint and they will look into it which could take 3 months to resolve! As this is a very long time i would like to offer you half of your payment back that you have paid as a good will gesture, just until we can find out anymore. Please let me no if this is okay as neither of us should be out of pocket.

要約すると、行方不明な荷物を探すには3ヶ月かかる。払った金額の半分もどすから勘弁してくれ。
でしょうか？

英語が達者な方、よろしくお願いします

ちなみに、送料を含めた金額は￡60.00弱です。