Why didn't you pay this at discount and count yourself lucky?
Challenging the PCN lays yourself open to prosecution if the council is minded to report you to the police but they probably won't bother.
If you want to take the risk and not pay £160, say you are challenging the PCN because of procedural impropriety on their website as this is out of order so the PCN must be cancelled.
The amount outstanding on the Charge Notice will increase to £240.00 on Fri, 12 Sep 2025. Please pay £160.00 now.
and enclose the screenshot.