Useful language for CAE writing

Formal letter Letter of complaintOpening expressions

Dear Sir / Madam,Dear Mr Waters,I am writing to complain aboutI am writing to express my dissatisfaction withUseful vocabularyon this particular occasionextremely (rude)

unacceptable (treatment)

terribly (disappointed)

Closing expressions

I look forward to hearing from you.Yours faithfully (when you begin Dear Sir / Madam)

Yours sincerely (when you begin Dear Mr Waters)