Dishonest billings and transactions

I called Thrify Car Rental and spoke to Sagree. After numerous discussions with her, I agreed on a vehicle and confirmed costs with her telephonically. I then sent her a follow up email confirming our discussion, as follows " Please note that as discussed, we require the VW T5 Automatic with Aircon. We would like to take up the 400kms per day option and will collect the vehicle on the 04 October at 7.30am and return it on Monday, 09 October at 5pm. The agreed price was R 6871 with a R 4000 refundable deposit.' She then sent me the booking forms which I completed and confirmed my husband would collect the vehicle. She liaised with me a few times on email about what additional information was required for the booking form but not once contested the price confirmed nor the date and time of delivery. When my husband collected the vehicle the agreed price was deducted. However on the 11 November, Thrifty car rental deducted a further R 1362 and when I enquired why , they stated that the vehicle was meant to be returned at 7.30 am on the 9 Oct hence we where billed for an extra day. In addition they stated that this was discussed with my husband when he initially collected the vehicle but this was not done. If it was done he would have disputed it immediately . We had spoken to Sagree on at least 5 occasions prior about the fact that we were travelling to JHb and would drop off the vehicle on the afternoon of the 9 October when we return to Durban and not once did she contest the time or dispute the price initially given. My husband signed the contract as requested believing that this was aligned to what was stated on mail but only to be told that the contract stated the drop off time as 7.30. We are very angry because not only was Sagree dishonest in her dealings with us but also that the contract drawn up contrary to what was agreed and requested. I have escalated the matter to their Branch Manager and Somai from the customer care division but they too were not helpful. I even requested that they review camera footage and telephonic recordings to verify our version to no avail.