Two weekends ago, I rented car in Dublin airport with Hertz (actually a franchise called Ryan's Investments). I had reserved with my Amex Platinum and was given a rate of €51 for three days (actually slightly more expensive that the competition but I wanted to earn some points). When I got there, I declined all insurance, as usual, but I hit a new charge that I've never seen before: A Supplementary Liability Waiver. They also insisted on a €5000 deposit and told me I was liable for the full value of the car. I called Amex at the desk and they assured me that I was covered for the value of the car up to €75000 (it was a Ford Fiesta so unless it was diamond encrusted there was no way it would top €15k).

I can't find this additional charge on their website, although they claimed it was there. Obviously, it's not the amount of money, but the principle of the bait/switch that annoyed me. In any case, I had three options at the time:

1. pay €17 per day for CDW/LDW;
2. pay €7 + tax per day for SLW, or
3. pay €65 for a no show fee.

I went with the cheapest option and I've disputed the extra charge (i.e. approx €24) with Amex (who are dealing with it) and I'm complaining to the EU car rental dispute organisation (ECRCS).

What I'm wondering:

• Will I end up on the DNR list with Hertz (not too worried as I'm angry with them and not planning to use them again)?
• Will there be any other consequences for the chargeback? Amex told me that I didn't need to submit any additional information but if Hertz disputed it, there might be a need in the future.
• Is there any way to complain to Hertz corporate regarding their franchise's actions? Should I complain somewhere else?
• Has anyone else had this experience? Is this a uniquely DUB problem?

Thanks for any advice!