Originally Posted by
elie.g1102
The nightmare is that 1) I paid a fortune by a different rental company, 2) I got banned from Sixt due to "bad behavior" ...
Though I understand the predicament you went through, I would not call it a nightmare. They did not want to use your card (for whatever reason, right or wrong), did you try using another card? Did they atleast try to swipe/authorize it? If it was a debit card, it might explain why they rejected it?!!
For the second part, can you elaborate a little bit?!