<prompt> Human: Gist of it, for starters, is that I overpaid an Ebay fee I owed on my sisters account, by 350. The final value fee was just 250, but I had thought it was 600, so I gave my sister the 600 to cover it. And now she wants to keep the 350 I overpaid.She wants to keep it on the basis that I supposedly said it was okay. But what I actually said to her was that whether or not she passed along to Ebay the 600 I owed them, was of no concern to me, since it was her account; and ultimately shed be the one on the hook if they came after the money. I found out the next day that the Ebay fee was actually only 250, and now she wants to stiff Ebay for the 250 which I dont care about, thats her business and keep the 350 I overpaid, as well. For the record, I had already given her 150 for use of her Ebay account for this single transaction.  <response>: Sounds like more of a relationships question than a personal finance one! Its your money, if you want your money back Id communicate that and request that the money is deposited into your account. Id also get my own eBay account to avoid this in the future! 