On 24 Oct, 20:49, trainmanUK wrote:
Only problem I can see is that the detail of the oyster card may be in
his reader. *If he still believes, incorrectly, that you are in the
wrong he could possibly cancel the oyster card. *If it was registered
you might get a letter with a penalty fare request. *Just keep the
ODTC and wait and see what happens

Don't just do that at all.

Complain like hell to TfL, London Travelwatch, the GLA and anyone else
you can think of.

Accuse them of systematic fraud if their staff are forcing people to
pay twice for the same journey.

Above all, do not let it drop. Too many people do.