Unfortunately, [ then say what is wrong and request some action]
Unfortunately, we have not yet received the photocopiers.
Unfortunately, the photocopiers you sold us have broken down.
Please could you deliver them soon?
We would be grateful if you could come and repair it without delay.
We would appreciate it if you could deliver them soon.
I should like to draw your attention to N.
(the fact that) 子句
I should like to point out that…
I should like to remind you that …
I hope that is not necessary to remind you that …
It is now over nine months since we placed this order, and we are still waiting for cabinets. We must insist, therefore, that you deliver them immediately.
Unless we hear from you within seven days, we will take legal action.