-We would like to inform you about the shipment of rotary mowers received today.
-I am writing in connection with your letter of 10 January concerning the above order for some bathroom accessories.
-I am sorry to have to write to you about a delayed delivery.
-I could not believe that a big supplier has made a mistake.
- I am writing with reference to order No. 1234, which we received yesterday.
Stating the problem