Avis charging me a full day claiming I was 37 minutes late on returning the vehicle

I took a vehicle on 18 February 2023 at around 17:47 according to my records that include photos with timestamps. I then returned the vehicle on 10 March at around 17:50 according to my google timeline with timestamp again. Keep in mind no one helped me to check scratches, I was just told if I see anything I must take pictures

Avis sends me an invoice claiming I took the vehicle at 17:23, but I reminded them that when I got to their branch the vehicle I had asked for was still at their depot and I had to wait for it to arrive at the Cape town airport. According to Stella(supervisor) at the airport, they started capturing my details and a vehicle at 17:23 and so I'm responsible from that time. Funny thing is they could not show or prove to me the vehicle they captured at 17:23, which tells me someone was inefficient in that they started my rental at 17:23 but I had no vehicle at that time. It also means the claim is a lie because how do you capture a vehicle that is still at the depot and hasn't arrived at the branch.

Now Liz or Lizzy form customer services informs me I returned the vehicle at 18:00 despite me informing her that my google timeline clearly shows I was at their Rivonia branch at 17:50. Now I'm being charged a whole full day for bringing the vehicle 37 minutes late, that is taking it at 17:23 and returning at 18:00.

Even it was so, how the hell do you charge a whole full day for 37 minutes late when anything could have happened that could reason the 37 minutes i.e. checking scratches around the car, queuing and waiting on returning the car resulting it being checked in a few minutes late by their people etc.

Avis is really ****ming people this way, I will escalate this matter even further if this issue is not rectified immediately. Now I've been waiting for a call because I was promised a call back yesterday by Liz.