Yesterday I went from Canning Town to Bounds Green.

Used my PAYG to go through barrier at Canning Town, then used PAYG as I
went past the swipe thingy on the Silverlink/NLL platform. I was going to
go to Highbury and Islington and change.

I then remembered from the recent thread on UTL that the PAYG is not meant
to be used from Canning Town north of Stratford so I went back to the tube
(I'd just missed the Silverlink anyway). No more swipes or barriers. And
completed the journey on the tube.

Will I have been overcharged - ie charged for a Silverlink journey I never
actually took? I wasn't sure whether, when deciding afer all not to use
Silverlink, I should swipe at Canning Town again or ignore it. So I didn't
swipe out, in case the system (since I'd been on the platform for half and
hour) would think I'd done a round-trip Canning Town-Stratford-Canning Town
or something.

If I have been overcharged, any way of getting them to reimburse me? Or do
I (somewhat unfairly) have to put it down to my own fault for changing my
mind about my route after realising I couldn't legally do it on PAYG but
after honestly swiping the card on the thingy (what's the technical term
for these swipe thingies) at Canning Town platform?