Complaint about Poor Service Experience with XYZ Company

I am writing to formally lodge a complaint regarding the subpar service I received from XYZ Company on [specific date]. Despite numerous attempts to resolve the issue through customer service channels, my concerns have not been addressed satisfactorily.

The primary issue revolves around [describe the main issue, e.g., delayed delivery, faulty product, poor customer service]. I initially contacted XYZ Company on [date] to report this problem. Although I was promised a resolution within [time frame], the problem remains unresolved.

I have attached copies of my communications with customer service, including emails and phone call logs, for your reference. Despite my repeated follow-ups, the responses I received were either delayed or inadequate. This level of service is unacceptable and falls short of the standards expected from a reputable company.

I request a prompt resolution to this matter. Specifically, I would like [state your desired outcome, e.g., a full refund, replacement of the product, etc.]. If the issue is not resolved within [reasonable time frame], I will have no choice but to escalate this complaint further.

Please acknowledge receipt of this complaint and provide a timeline for when I can expect a resolution.

Thank you for your attention to this matter.

Sincerely,
[Your Name]
[Your Contact Information]