Travelling to Waterloo today return and bought a ticket from Cheam (no barriers). Got to Waterloo and realised it wasn’t a QR ticket and needed to collect. So I tried tapping out at Waterloo which failed so spoke to someone who let me out at the gates. On the return trip I collected the original ticket from machine. But obviously going to be charged the incomplete train fare. I believe it’s gone up now, do I have grounds to dispute as I did buy a full ticket or am I going to have to suck up the additional fine?