check what kind of fuel the car needs before you put in the wrong one?
obviously you have to pay for the damage, the amount is completely normal (please include in your calculation that a full tank is needed as well)

the thing with the pickup I don't understand to be honest. why would there be a difference between where the cars are located and the desk? one of the stations in cologne moved in the summer, maybe they were in the process of that. otherwise very strange.

btw, where does it say that they have to speak english? would a french expect that the rental agent in israel speaks french?
btw2, the you can print the contract in english and I am pretty sure the type of fuel is mentioned on it.
btw3, Sixt doesnt have cars which do not run on E10. doesnt make any sense this comment.