Cosiflyer

So I've also rented SIXT about 5 times in the past two years, never an issue. I've now also rented Hertz approx 5 times in the last two years, and also never had any issues, up to now.
Except the last time..... and this will be the last time ever.

I rented an Alfa Romeo Stelvio for 5 days on Hertz.com. Quote: 380€ with 1250 km's included and a fee of 69 cents / km in case I surpass the 1250 km. This is not a bad deal.
However.... 4 days after I return the car, Hertz calles me up to ask me if I actually returned the car! Sorry? Apparently they lost it in the parking lot.
Shortly after that I get the final bill: 600€
What happened:
they increased the rental price with 50€
they charged me 92 cents / km for additional km's
they added VAT on the entire bill (whereas it was included in the rental price according to the contract)
Needless to say: Hertz say they will not ammend the bill.

Thanks Hertz, this was the last time you saw me. Unfortunately, they're one of the stronger FlyingBlue partners.... but I'll now just shift my future car rentals fully to SIXT.