OP, I'm just trying to get the hard evidence up front.
The CEO's photos clearly show your car and (although not in the same shot) a traffic sign which has part-time restrictions mounted vertically on a post as follows:
Mon-Fri 4pm-7pm No waiting and No loading.
Parking at all other times free to resident permit holders, alternatively pay either by app or by contacting the specified number.
The PCN gives a time of contravention as 4.34pm Tues. 5 Nov.
So, if this sign regulated where you were then IMO the PCN was issued correctly.
GSV shows the local area where the CEO's photos place your car and the sign applies.
You say you spoke to a Ringo agent who advised that parking was free until 4pm which is correct if you told them you held and were displaying a valid permit.
Given the hard evidence, IMO any claim that you were advised to the contrary by a competent person would not have succeeded. Whether there were any technical/procedural defences, we don't know as you hadn't progressed sufficiently through the enforcement process.