On 28 Feb, 08:32, Walter Briscoe wrote:
On 24/02/10, I entered Moorgate at 16:30 and left Euston at 16:43.
I entered Euston Square at 16:49 and left Moorgate at 17:10.
I was charged 5.80 for Euston Square entry and 6.00 for Moorgate exit.
I had already capped travel in Z1-2 on my registered Oystercard.
On 28 February 2010 03:22:49, TfL sent me an email "... Due to an
operational issue, we calculate that you are due a refund of 11.80.
This is now ready for pick-up at Moorgate. ..."
I am a little impressed.
Weekend mornings are good times for Oyster help on 0845 330 9876.
I was unable to get an explanation for the systemic failure.

This isn't the typical OSI problem that people have talked about
though, is it?

It just looks like the system was charging completely the wrong fares
to everyone and they couldn't miss it.

So I don't infer that the inexcusable situation where people are
repeatedly getting overcharged, because the system strings separate
resolved journeys into one and then decides that the resulting journey
is too long and splits it into unresolved/unstarted journeys, is
likely to be addressed in such a helpful way.