我咁寫可以嗎? (email)

Dear Sir,
Subject:-Terminate the internet service after expiry date(n)(A/CNo.16898168)
I regret to inform you that I will no longer use the internet service when the contract is expired(adj)on Thursday,June 25,2015.
An official document on the formal expiry(n) of the contract is requested.
Best Regards,
Connie Young.
(-----)

我知道啦,謝謝本週之星。

Subject: Termination of the internet service
Dear sir:
I would like to tell you that I will no longer use your internet service when the contract is due to expire on June 25, 2015. The detailed information of my contract is A/C No.16898168.


Best regards,
Connie young

英文文法係差少少，但對方(ISP)總會睇得明你想講乜。
# 希望你多加留意英文之動詞(verb)，名詞(noun)和時態(tense)，即 expire, expiry 和expired之用法。

好少人用TELL YOU，用INFORM YOU比較大體，再得體一些用I REGRETTED TO INFORM YOU，意思就是，我好遺憾咁通知你一聲。