The faction has also attacked President Buhari over his supervision of the party.
Buni, Yobe State Governor, is Chairman, APC Caretaker/Extraordinary National Convention Planning Committee (CECPC).
On Monday, a unit within the party, Progressive Youth Movement, announced his replacement.
They named Mustapha Audu as National Caretaker Committee Chairman with immediate effect.
Audu said a National Reconciliation Committee will be formed to reconcile aggrieved members before the February 26, 2021 convention.
He further announced a zoning formula for Positions in the new National Working Committee (NWC).
In a reaction, John Akpan Udoedehe, APC National Secretary dismissed the “felonious activities of the purported group”.
The scribe’s statement said they are unknown to the party, its structure or as a registered support group and therefore non-existent.
“However laughable, the criminal attempt of the purported group to usurp the leadership of the President Muhammadu Buhari-led APC now bothers on treasonable felony.
“Relevant security bodies must now check and address their unscrupulous activities. The attention the purported group seeks will not be given to them by the party.
“We can only advise that the general public completely disregard them. They are not registered members of the APC and are being used by opposition elements and fifth columnists to cause confusion.
As widely reported, the successful meeting between the APC leadership, Progressive Governors’ Forum and the President produced February 2022 as the timeframe for the National Convention”, Udoedehe noted.
Ut was confirmed that the APC National Secretariat has been under heavy security in recent weeks after intelligence of a planned forceful takeover.