Dear [Recipient Name], I am writing to ask you to stop [the specific activity] relating to [the person, property, work or matter concerned]. The incidents I am referring to occurred on [dates] and involved [describe the conduct factually]. I hold [records or other evidence] documenting [what those records show]. The activity has affected me by [specific effect]. Please stop [the exact conduct you want to cease] and [any specific additional action you are requesting]. I ask that you confirm in writing by [response deadline] how you will address this request. If the activity continues, I intend to [the next step you actually plan to take]. I would prefer to resolve the matter without further escalation and ask that your response address the incidents described above. Sincerely, [Your Name]