Writing a complaint letter that generates a satisfactory response is as much an art as it is a science. Here are some guidelines that may increase the likelihood of a quick answer:
Keep the letter concise and to the point. Resist the temptation to provide every last detail.
Try to find something nice to say about the provider and your past working relationship. That sets a positive tone.
Focus on linking your complaint to the provider's mission, emphasizing how you feel it is your obligation to point out the inconsistency.
Assuming the problem doesn't relate to a service representative's behavior, avoid personalizing your complaint. Your dispute is with the provider and its processes, not any single individual.
Be prepared for the follow-up call and have a clear understanding of the key requirements for the provider to adequately address your concerns.
Document, document, document. Just as measuring and retaining a history of CPU peaks and troughs are important with server management, so too is building a service-documentation file, aka the paper trail. The file should include memos, letters, server logs, trouble-ticket reports--anything pertaining to the provider. Bottom line: If it's not in writing, it never happened.