clio mk3 ignition barrel HELP!!!!

hello iam new to this forum



i have a Renault Clio 2008 mk3 1.5dci 5 dr



my ignition has become sticking and sometimes the key wont go in ive bought a brand new genuine Renault ignition barrel, 2 key blades and door lock the problem iam having is ive stripped everything out to the ignition barrel and i cant seem to remove the pin holding in the barrel ive hit it from the opposite side on the bottom pit with a punch and hammer it wont budge the pit out from the top ive put the ignition on different positions which i know wont really matter but it just doesn't budge at all



Any ideas anybody will be much appreciated



thanks for you time rich