Use this email templates to answer your users when they make a right request.
Dear [Name of Data Subject]
On the [date of receipt], you asked us to remove your contact details from our advertisement campaigns and files (email and/or postal).
In accordance with Article 21.2 of the General Data Protection Regulations (GDPR), we no longer process personal data concerned by your right request and will not be sending you any more ads.
In the hope this answer will satisfy you, please note that you received this communication within the time limit of one month set by the GDPR.
Best Regards