They cant issue a second NTK, even if they did it would have been outside of the 14 day window so not POFA compliant. Anyway they won't accept the PCN isn't POFA compliant as they will think it is. It's highly unlikely POPLA will either (see the Euro Car Parks thread).
Please be aware the advice you are being given is to run the process down and hope they don't proceed to court. You may have to defend this one properly and the POFA non compliance argument is proving to be extremely weak.