On the 25th July 2025, I hired a car from them for a month and paid them R6000 for the rental plus R3900 for the deposit

On the 25th July 2025, I hired a car from them for a month and paid them R6000 for the rental plus R3900 for the deposit. Upon returning the car on the 25th of August before noon, I was told that my deposit of R3900 would be paid back within 14 working days. I have been given the runabout and my emails went unanswered. Yesterday I received an email from their Director, Nadia Viljoen that sent me an invoice stating R290 for Admin fee, R280 for a car wash and R3500 for using the car after 12 at night. Mind you, I was advised upon collection by Marikie that I am getting an unwashed car and I will not be billed for it, she wrote this on my contract. I was never advised that the vehicle can't be driven after 12am. I requested Nadia's mobile number and was told they are not allowed to give out her number. The only means of contacting her is via a Gmail account.