They are charging me R6000 for a R450 Mud flap replacement.

Don't ever rent a car from Europcar guys, so I rented a car from Kimberly Airport, the car was low profile, so when people are in the car and you drive over a speed hump it scratched the mud flap below, okay so when I returned the car they informed me that the was damage underneath and I explained on the form what happened, I get back to Joburg search how much a mud flap costs for that model and it's R450, but I paid R1000 protection cover so I should be okay, then I get an invoice for R6099.35, damage liability is R4714, I call to ask for the assessment report because I am also billed for the car assessment, nothing, they keep sending SMSs and Emails telling me to pay, so when you call they bounce you around and finally you get someone who will take your details and call you back because her system is offline, the story repeats the following day. Still no assessment report sent. I am such an idiot for booking a car with them, when I went to collect the car at the Airport everyone went to Avis, it was just me at Europcar.