Double deduction

Rented a car on 02/04/15 there was a double deduction on my credit card,now I have been struggling to get my money back.i emailed two consultants my bank statement so every time I call the branch they tell me that the money does not reflect on their side.I m beginning to lose both trust and faith in the brand.I was also not happy with the car that I booked it had a dent before than when I took it back they billed it on my account,the lady that was doing my booking said she will check 3 bookings before mine next thing I know they had deducted money.