Avis claim that I damaged rented vehicle.

I rented a car from the 23th of March 2021 and returned the car on the 31st of March 2021 On delivery of the vehicle damage of the paintwork was recorded on the back bumper in writing and signed by both parties. My daughter returned the vehicle without any additional damage at the agreed location. At delivery no mention was made of any additional damage . More than a week later I was informed of additional damage and on the 11th of April they sent me pictures via WhatsApp of damage of paintwork on the back and front bumpers of the vehicle. I was only aware of the damage at the back of the vehicle as delivered to me, now they claim that I am also responsible for damage to the front. Avis said they would investigate the dispute and revert back to me within 7 days. They dit not report back to me and promptly deducted the money from my bank account . R1554.35 without any invoice or further communication. Next time I will take pictures of the car before taking it back because it is your word against theirs . Very bad service from Avis! Ref no E***