請幫忙把以下內容翻譯成英文 (急)

剛剛收到10月2日至6日的帳單, 為何這個月總共收到3次帳單呢? 以往都是每月發兩次帳單給我司的。下月是否會變回一個月發兩次呢?請盡快回覆, 謝謝!

We have received your bill for the period of October 2 to 6. We are baffled as to why you have sent us the bills three times this month, as it is different from your usual practice of sending us two bills in a month. We are eager to know if you will reinstate your normal practice next month. We look forward to your prompt reply. Thank you.

2014-11-06 07:27:30 補充：
Note: I put the focus on making it a more formal business letter instead of a straight-forward translation.

Just received a bill October 2 to 6, and why this month received a total of three times bills it? Past are issued twice monthly bill to my Division. Next month whether it changes back to twice a month? Please reply as soon as possible, thank you!

Just received a bill October 2 to 6, and why this month received a total of three times bills it? Past are issued twice monthly bill to my Division. Next month whether it changes back twice a month? Please reply as soon as possible, thank you!

剛剛收到10月2日至6日的帳單, 為何這個月總共收到3次帳單呢? 以往都是每月發兩次帳單給我司的。下月是否會變回一個月發兩次呢?請盡快回覆, 謝謝!
Having received the invoice for the period from second to sixth of October and I would like to know why there were three invoices delivered this month. As far as monthly invoice being concerned, the routine way of doing was only twice a month; then, for the sake of reducing the papework would you be kind enough to deliver twice as beginning next month. If you agree, please inform me at the earliest.

翻譯英文 剛剛收到10月2日至6日的帳單, 為何這個月總共收到3次帳單呢? 以往都是每月發兩次帳單給我司的。下月是否會變回一個月發兩次呢?請盡快回覆, 謝謝!
翻譯:Why are we sent a total of three bills this month, including the one for 2nd to 6th October we just received? As there were always only two bills for our company each month in the past, please let us have your reply asap as to whether the number of bills in a month will be back to two next month. Thank you!


2014-11-05 17:32:02 補充：
asap=as soon as possible

I just received the bill of 2/10 to 6/10, i don't understand why i received a total number of 3 bills in this month? in past i usually received 2 bills every month. just wondering if the bills for next month will be back to twice a month? please reply ASAP. Thank you!

Just received from October 2 to 6th Bill, received a total of 3 times why this month bills? Always the firm's billing to our twice monthly. Next month whether it will change back to it twice a month? please reply as soon as possible, thank you!

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