Who is the complaint against?

Help me write a complaint to ______ that gets a result. What happened: ______ What I want them to do: ______ I'm sending it by: ______ Please write it firm, specific, and unemotional — the tone that actually gets refunds, not the tone that feels good to write. Include a clear deadline for their response and state what I'll do next if I don't hear back. Keep it under 200 words. Then tell me the one sentence in it that's doing the most work, and why.