<prompt> Human: Im the founder of an early stage startup, and this happened yesterday.My partner went to transfer funds to a supplier in China for about 4200. I woke up to a notification from the supplier that they received the funds with an excess of 38k. Weve never worked with this supplier before, but luckily they were honest and theyve offered to wire the difference back to us on Monday.For the time being, the bank account is almost drained. We have several orders pending because were getting our inventory ready for the holiday season, and if any of our payments get declined it could cause us significant delay.Since it was an error of our banker, does the bank have any responsibility to correct this quickly? Will reporting this cause big problems for the banker who performed the transaction?Edit: In the comments I explain my partner signed off on the incorrect amount without noticing, so its the fault of both parties. No one whos able to do anything about this is currently working since its the weekend so we have to wait until Monday. Will update when things are resolved.Edit2: So much blame towards my partner in this thread and to an extent its warranted, but he provided all of the correct information for the wire and she had it in two 2 forms - email and in print. An extra 0 was added to the amount by the banker and it was not caught by my partner. It all really sucks but I guess at the end of the day were lucky the supplier is admitting that we overpaid.Update: The bank handled everything awesomely! It turns out the banker was already in the process of requesting a return of funds when my partner went in this morning. Luckily for us, the supplier did indeed wire the difference back to us. Had they not, it would have taken our bank a while to reclaim the funds since theyd need the receiving bank to agree. Our bank is going to cover any fees associated with the return transaction and any difference in amount resulting from exchange rates. They offered to allow overdraft on our account had we needed that. Additionally the banker closely monitored the return wire and made sure it posted as soon as possible so the funds were already back in our account by afternoon! None of our inventory orders fell through, we just had to sweat it out over the weekend : We were so lucky our overpaid supplier was honest and diligent. And were so grateful that our bank had us covered. Thanks to all for the support and suggestions!  <response>: Source: I work with large corporate clients at a large bank.So sorry this happened to you! If your supplier wires the funds back on Monday, they should post to you account same-day, assuming it doesnt get held up in any kind of review.If the supplier decides to play hardball and wont return the funds, your bank can request a return, but it is up to the receiving bank whether they grant the request or not. Seems like if youve got an invoice stating the correct amount youve got a pretty good case, but you never know. Should there be some kind of a delay, your bank may be able to provide a provisional credit until your funds come in. Its essentially an interest-free short term loan. They will put the funds into your account and then when your money comes in they will reverse the credit.We base our decisions on whenif we provide these kinds of credits based on the relationship with the client and the dollar amount, so it may or may not be an option in your case.Good luck! I hope you get your money promptly! 