A firm written notice asking someone to stop contacting you and stating what you will do if it continues.
Subject: Notice to stop unwanted contact
To: [Recipient full name]
Date: [DD Month YYYY]
Dear [Recipient name],
I am writing to tell you clearly that your contact towards me is unwanted.
From today, you must stop:
Any necessary communication must be limited to: [e.g., email only / through a named third party / regarding a specific matter].
If the unwanted contact continues, I will keep a record of all incidents and may report the matter to the police and/or seek further advice.
Please confirm in writing that you will comply with this notice.
Yours sincerely,
[Your full name]