Dear Sir or Madam:

My name is----------, an applicant to the ------------ program of your university. I have already sent all my application materials to you by post.

I am writing to clarify one problem. I just got a message from ETS, saying that they could not charge my credit card for sending the TOEFL and GRE reports. However, my credit card works perfectly well with other payments in my applications. I will check with ETS to find out other alternatives to have my reports sent to you as soon as possible.

Meanwhile, since the application deadline is approaching, in order to save time, could you please refer to my photocopies of TOEFL and GRE scores reports first for your consideration of admission? Sorry for any inconvenience it may incur.

Thank you for your assistance.

Yours sincerely,

Dreamer

以上短信謹供參考。
個人意見：寫信要突出重點，同時要簡潔。把事情說明白，并提出解決辦法即可。