"Richard J." wrote:

Mizter T wrote on 23 September 2011 09:52:24 ...
[snip]
I think what's happened here is that the 40 pounds actually did get
credited
to your Oyster card, so essentially you're currently owing TfL that
money,
hence why they've blacklisted your Oyster card. If you pay them that
money
then they should de-blacklist your Oyster card.

Yes, I agree with that analysis. The emails are just the system pursuing
a contractual debt. But if you can contact a human being, they might
agree to cancel the debt (and the Oyster card) provided you return the
card to them. Worth a try, anyway.

What I don't know about blacklisting is whether, if a blacklisted Oyster
card comes into contact with a reader, it is instantaneously 'nuked' and can
never be used again, or it is just blocked from being used until the
blacklist is lifted, or whether there are perhaps two types of blacklisting.