OUTRIGHT FRAUDULENT - ILLEGALLY DOUBLE CHARGED. I booked a rental car from Austria Innsbruck Airport Sixt for ONE DAY RENTAL. I picked up the car on 5 December at around 2pm. I dropped off the key at the drop off box on 6 December at around 11am, told the counter staff (stood a few meters away from the drop off box) that I had dropped off the key and asked him a separate question. Subsequently I received an invoice saying my drop off date was 7 December hence they charged me TWO DAYS RENTAL + LATE RETURN FEE. Emailed customer services to ask for refund of the overcharged amount, and provided evidence including my train ticket to another city on 6 December at 12:17pm, hotel stay in that other city on 6 December, as well as my conversation with the counter staff also on 6 December at around 11am. EVERYTHING IGNORED. I will be filing a dispute with credit card company and also looking to file official complaint with relevant UK/EU authorities. This is not even grey area - it is simply illegal to scam customers like this.