Statements that are true or that reflect an honest opinion (e.g. negative review) are not usually themselves a basis for defamation. You should carefully consider the facts before you make a claim (and take legal advice if in doubt), as a false claim may expose you to liability.
Warning: Any statement you make may be used in court proceedings. Any false, misleading or inaccurate information provided by you may result in civil and criminal liability.
You can also include your daytime telephone number, so that Creakle may respond to the Notice.