具體的情況不是很懂，幫你稍微寫了一下。

看看行不行。（注意回復的時候，把他們上次給OFFER 的那個郵件捎上）Your First Name Your Last NameYour addressYour telephone numberyour emailyour ID (reference)Dear Sir/MadamI’m writing to notify you of my decision to accept your offer to enrol in the …(your course) at…(your university).Thank you for your time and consideration. Please regard this letter as my formal acceptance. Unfortunately, as I checked my application status online, it remains…(pending or,把網上的那個狀況寫上去). 或者：There is no record of my application in the system(看你具體是哪一種情況）I would like to find out whether my application is successful,.Your help in this matter will be very much appreciated.Yours faithfullyYour name