I had a similar (but a bit less extreme) situation with an electric Polestar rented from Hertz for 5 days in Manchester during 2023. They had charged me mileage on several thousand miles I hadn't driven. When I raised it with them they kept saying they were looking into it and a couple of months went by. Then I tried a chargeback on my credit card but Chase refused because the amount charged was correct in terms of the invoice and chargebacks won't work if the invoice received from the supplier matches the amount charged unless I could prove I had not received the product.

After three months, I threatened legal action and put my case to them. For me to have driven those miles in an electric vehicle in that short space of time I would have had to have recharged it many times. As the recharge option uses their key fob and goes through their account they would have charged me for the electricity which they did not. If I had charged it using an ordinary home plug I explained that it would have required to be on charge for more time than the total rental period. They came back to me within a week and refunded all the additional the charges.