The consumer body has also demanded a public apology from him on the issue within a month.
Manch patron P G Najpande who is known to take up public causes through the public interest litigation (PIL) route has sent a legal notice to Digvijay Singh through his lawyer, Amit Patel.
He said that the Congress General Secretary's statement against the Supreme Court's "caged parrot" comment about the CBI in connection with the coal scam amounts to "contempt of the apex court".
He said that the apex court's comments should be taken in the right spirit to reform the system.