求翻译：但是在40*26的计算上出现了问题。本来是1040算成了1400，这样就多收了您的360元。这是给您的360元，请您在单子上面签一下名字，对于我们的失误我深感抱歉，我们不允许再有下一次发生，同时，我会一直学习口语期待下一次为您服务！是什么意思？

But problems occurred on the calculation of 40*26. Originally 1040 1400 was counted, so around overcharged you $ 360. This is $ 360 for you, you in the list, please sign your name for our mistakes, I am sorry, we do not allow again next time, and, I'll learn spoken language look forward to the next as you!