8th Aug. the bank informed us the funds received, we think it is from the Botswana customer, because only Botswana customer told us they transfer the payment and the amount is right. We finished and delivery the expanison bellows, the customer received it later. 12th Aug. the new customer from Congo said whether we received the payment, so we wait the news from the bank and went to bank some times. 2nd Sep. we went to bank with the copy of Congo payment, the bank said the funds have received 8th Aug. So we know that we made a serious mistake. We contact the Botswana customer and explain all the problem, the customer said he will go to bank and reply us; we apologize to the Congo customer and start production, promise the goods will be finished ASAP. Now the expanison bellows is preparing, hope we can take cooperate with the two customer smoothly in the future.