[wildylion]

Side question, but what happens if there's a technical error with the service provider that leads to double spending?

Example: we bought tickets worth 300 EUR from Deutsche Bahn, they were hit by a DDoS and couldn't complete the transaction.

We got charged *twice* (i.e. 600 EUR and not refunded yet. AND no tickets!!!

Now they claim all they can do is to give us 600 EUR in vouchers (that are not even transferrable).

Would a Chargeback work in this case?

And my friend (who's ordered the tickets) has a very traditional bank that only gives a statement monthly, and probably accepts claims on every 29 of February, between 7 and 8 AM and only by fax (IYKYK those German companies...)