Parking Ticket

Got myself a parking ticket for 'Exceeding Maximum Stay' parking at a Tesco. However, their camera's have clearly buggered up because it was two separate visits. With 5 hours between each visit (the sign states no return within 1 hour).

I want to appeal this and have started the process but not sure how I can prove this. I have two separate transactions for Tesco that day in my banking app but they do not provide a time stamp, just a date. It was also 13 days ago, so any receipts are long gone.

Any one got any advise on how to appeal this?