The parking attendant would have to put the time and date that the ALLEGED OFFENCE took place, I doubt very much that he would have photographed the ticket.
As you had a valid ticket for the time stated, then refuse to pay the fine, tell them to take you to court, it is your word against theirs, they have no proof that the ticket was not displayed properly, however, you have proof that you had a valid ticket.
Councils and other parking agencies are doing this more and more to raise revenue. We need to stand up to them. It is petty jobsworths who have nothing more in their life than to exert some sort of authority.