Open their envelope -
Seal the envelope and write/print on the front:
RETURN TO SENDER
Unsolicited Mail.
Please remove me
from your mailing list.
And on the BACK of their envelope:
NO CONTRACT -
Revoked by Administrator
John Whobody Smith
CEO and Sole Shareholder of the
corporation/legal person -
Photocopy the front and back before you return it to sender.