Reference to your email of 日期, please kindly note our direct telephone number as following
xxxxxxxx 電話
Thanks for your kind attention to this matter and look forward to your usual support.
Best regards,
xxxxxx
I would recommend that you try to borrow from the library " write better speak better" or buy this and keep it as reference whenever you write something.
Dear xxxx,
Thank you for your e-mail requesting our direct telephone line. I am pleased to provide you with the phone number below.
tel. XXXXXXXX
Should you have any further questions, please contact me again.'
XXXXXX
This book is a good reference for you