I was at the car looking at the code to put in phone and the enforcement officer was hiding before putting ticket on taking a picture and walking away before I could grab him
When I saw him he didnt engage and walked away
Can you describe
exactly what happened between you parking the car, through to the PCN slapping a PCN on your windscreen. Most cases like this happen when the driver is not actually at or near the car.
Time is always allowed for payment to park; if it wasn't, nobody could park legally ! However, how much time is allowable is one of those undefined things that depends on circumstances. From what you have said already, you would seem to have a strong case for cancellation. Barnet are one of the more venal and rapacious London councils, but what you have received is sent out by all the London councils, being a Fob-Off letter. They do this because lengthy experience, (since an Act of 1991 !!) tells them that most people then cough-up. People pay because they know little about the process and are terrified of having to pay more so accept the discount option.
If you want to take them all the way, then if you are the owner as per the V5C Registration Certificate for the car, you should now wait for the Notice to Owner and submit
formal representations. It is quite possible they will accept your reps, but if they don't you register an appeal with London Tribunals, (a simple online request). Yes the full PCN will be in play, but when or if you win, you pay nothing, but Barnet will have had to pay £30 to London Tribunals.