Two hypothetical situations

Hypothetical situation, let's say that you work everyday during the week and also that Sunday at a shop (48 hrs week) however during one of the days of that week for some reason your login or your sign in doesn't take and the system does not register you as being there.

So you're 8 hours of OT is off the table until you can prove that you were there. You have some situational evidence but nothing absolutely concrete unless you can round up some witnesses which you probably can but let's say that's not an option right now. The shop does have security camera footage so it should show you being there, like you should see yourself.

So situation one is there is no footage, for whatever reason either the cameras weren't running that day or they deleted the footage as a space saving thing like once a week or whatever, the point is there is no footage. What do you do then?

And situation two there is footage that shows you there but because there was no registered sign in the company says they're not going to cover it anyway because if you didn't sign in you weren't working even though there's video evidence of you working. What do you do then?