The PM should be confirming the agreement made between the PM and the C not a unilateral "agreement" made by himself/herself.
I suggest that the C replies highlighting that it has not agreed to the extension and referencing 64.4 in that the PM has not reply within the time allowed (first notification)
I suggest that the C replies highlighting that it has not agreed to the extension and referencing 64.4 in that the PM has not reply within the time allowed (first notification)