Date: [Date]
To: [Recipient or role]
[Organization or institution]

Subject: Complaint about an order or service issue

Dear Sir/Madam,
On [Incident date], the following occurred: [What happened]. The relevant order or service reference is [Order or service reference, if needed].

I request [What you are requesting]. Please review the issue and let me know the next steps and expected timing. I can provide relevant supporting evidence if needed.

Thank you.
Sincerely,
[Your full name]
[Contact detail, if needed]