First of all, try to find bills with similar amount, time and place of consumption, and the total amount is greater than or similar to the loan amount. Secondly, invoices can still be reissued within a certain period of time. The borrower can recall the place of consumption and apply for a replacement invoice. Consult customer service, explain the specific situation and see how to remedy it because of your carelessness or loss, such as providing transaction flow. See if there is any advance notice to keep the consumption voucher after each consumption, and pay attention to the retention time.