什么是outstanding charge?

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刚收到这么封邮件：
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* S" U; F! C; ~4 ]Dear Student 4 j5 m( J/ \2 n

! |4 X" d8 V! C2 i9 x: FAccording to our records, there are outstanding charges relating to your accommodation due for payment on 21st October 2007.
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I should be grateful if you would arrange to pay this within the next 7 days at your Hall Administration Office, who will also be able to confirm the amount outstanding. 5 }# i$ `. o. [7 U5 Q* u' r1 e

. q) [& b; m! X9 ~1 M  R6 WIf there are any personal reasons why you are unable to pay this outstanding amount, it is essential that you contact your Hall Administration Office to explain your circumstances. If you have already paid, this reminder may have been sent because your payment received does not match your payment plan, please contact your Hall Administration Office to change your plan accordingly.
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4 Y# \% K# D3 n; s7 U; hAn administration fee of £15.00 will be added to your account if you do not pay within the designated 7 days.
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If you have already paid in the past few days, I apologise for troubling you and ask you to ignore this e-mail. Accommodation OfficeUniversity of Manchester  Please consider the environment before printing this email.
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这是什么东西啊？ 住宿费我已经付过了啊？5 q; Y* m9 A3 V9 F( k9 Q: s
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非常奇怪中。。。
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有哪位知道是怎么回事吗？ 感谢说明！

第一阳光

我可是把住宿费全部一次性付掉的啊

第一阳光

哪位问出个所以然来了？
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分享一下。