Hired car from Bristol Airport thru carrentals.com which af somehow linked up. Prepaid full amount for hire car. Returned car and foudays after car returned SIXT issued a new invoice for £2300 and took it straight out of our bank account, wiping out all of our funds. On the invoice it says we drove over 3000 excess miles (3900 in total). We only had the car fo 9 days, including pick up and return. It was used for no more than 500 miles tops and we had unlimited mileage on the contract. Would have to have sat in the car and drove continuously for nine days without stopping to sleep to cover this mileage. Now fighting for a refund and compensation and having the devil's own job getting any progress. Legal action will follow soon.