I am being ****med by Europcar Kimberly Airport branch

I hired a car from Europcar Kimberly airport only to be ****med of my money. I think this lady by the name of Monique Detoit handled my account. I was never escorted to the Polo Vivo that i hired from this company for vehicle checking proceedure, the lady who was helping me just handed me the check sheet that was already marked, she read out the sheet to me told me where the damages are on the car and asked me to sign the damage sheet. Since i trusted this companyand due to the fact that i was not using them for the 1st time, i took the sheet and signed. She then gave me the keys and told me where the car is. i opened the boot of the car to store my bag and realised that there is a black mark on the matt of the boot and it looked to serious to ignore. I went back to the office and told her what i have noticed she then scribbles on the check sheet and said its fine that has been registered. I than went back to the car and took off. I returned the car on Sunday morning around 6:30am and threw the keys inside the dropbox and caught a cap to the city to go catch the bus. Today she is sending me zoomed pictures of the grille of the car, telling me i damaged their car? She tells me previous sheets dont show any info about the broken grille! Clearly these people banked on me not seeing this un noticeable crack on the grille of their car, they were probably going to charge me for the damaged matt aswell. Now she wants to hold me responsible for this broken, small and un noticeable grille that i had nothing to do with! Becareful of this company with ***** representatives! I actually have pictures to prove that the car was ok when i dropped the car off