xx你好，
我是财务部门的小李。贵公司有一笔款打到了我们公司的错误帐号里已经有八个月了，此事我们曾经多次与菲利普、Guy多次联系，但至今未做变更。时下已到年末，如再不做变更，这笔款就将要被银行退回。希望能协助我们尽快完成变更工作，如需我做什么请尽管联系。

This is greetings from Mr (Ms) Li in the financial department. Some money (最好根据实际情况换成那笔款的编号，这样让对方很容易就能理解) was sent to the accounts which has already been canceled (错误账号：是取消了，还是不是其他什么原因，此处按取消处理的) for eight months. We have contacted Philips and Guy several times for the above matter, but it failed to be dealt with. The amount will be returned by the bank if the correct account number is not offered by the end of the year. I would be much appreciated if you could do us a favor for the change of the account number. Should you have any questions or comments, please do not hesitate to contact us.

注： 切记错误账号不要翻成wrong account，因为The term “wrong accounts” actually refers to tax deferred accounts.