Bogus Charges

I booked online and paid in full for the booking. It was R840.05. I received a reservation document that showed no balance outstanding. There was no issue on pick up and drop off of the vehicle, at no point was I told there was an outstanding amount on the rental. When I got home and had a look at the rental agreement they had emailed through, they had added R155.25 to the amount saying that was outstanding. When I queried this they told me, the rental was actually R995.30. I emailed and said that didn't make sense and shared the reservation document I was sent upon booking, showing it was paid in full. Now my emails are just ignored. It's absolute nonsense that they have changed the rental price. Be very careful with this company, they just make it up as they go.