Missing Information on Clamping Sign

Hi all, I was clamped this week in a local supermarket where I often do my shopping. After reluctantly paying the release fee, I noticed that the signs in the car park don’t state how much the release fee is, which is written in to the law since 2017.

The signs also don’t have a contact name and phone number, or the correct iconography - both of which are also within the law.

I am considering bringing this to the small claims court and wanted to know if I have a case?

I have tried to speak to the manager of the store but he is holding his ground.

Thanks in advance.