First Bus 50 quid

Recently, I got taken of the Bus by these waste of resources, since I bought a student student, but I failed to grab my Student ID of my desk this morning

And naively provided them with information they wanted thinking I can quickly resolve the issue, and waive the fine.

Since then, they had declined me and are asking me pay 50 quid, or proceed through some charity which takes 60 days

Does anyone have any ideas on what I can do, as I rather walk everyday than pay another 50 quid to those scammy pests called First Bus