Free Traffic Legal Advice

Hi eveyone,
Looking for some help on this one if you can please.

I have received the below charge notice for unpaid tariff time at the carpark of Watermouth Harbour.
I used the carpark (and paid as per the attached receipt) while on holiday this year (launching our boat), for the date noted Initial Parking have sent me the PCN Letter for Unpaid Tariff Time

Due to its coastal location the mobile phone service there isnt the best, and coupled with my Just Park app needing to be updated it took a little while for me to be able to purchase a ticket, also at the end of my time there I also over-ran by about 3 mins at the end of the day.
I didnt have cash or cards on me that day just my phone.

I have tried to appeal to Initial Parking, but they have rebuffed my appeal (also attached), I used the above points (with the exception of not having cash or cards on me that day).

Is there any chance I can avoid paying this charge for the supposed total 25 min overstay?

Thanks in advance.

PCN Page 1
https://ibb.co/twXV2mLP

PCN Page 2
https://ibb.co/Xf1XcCxk

Parking Receipt
https://ibb.co/Tx0m9mYL

Appeal Reply Page 1
https://ibb.co/2YcHZzVZ

Appeal Reply Page 2
https://ibb.co/KcyMmw5f

I dont have a copy of my actual appeal, it was done through the Initial Parking website and they dont send a copy of what is written.
It was along the lines of the poor mobile coverage and needing to update the parking app.
I didnt mention not having cards or cash on me that day.

How would I know if there are any bylaws?

you need to be more patient till the right person offers help.

meanwhile I assume you outed the drivers identity in your initial contact?