Date
Name and Address
Dear Sir/Madam
This is to draw your attention to [state the nature of your complaint]. I would appreciate it highly if you take appropriate action towards resolving my problem [state what you want done about your complaint].
I am, hereby attaching copies of various documents [List the invoices, bills, letters, notices, contracts and receipts, etc.] to support my complaint. Kindly contact me using the information shown above, and I expect your reply by [date]. Thank you for your assistance.
Sincerely,