Disappointing experience with Avis/Budget Rental

Rental *** has reference. I rented a vehicle from Avis/Budget at O R Tambo Airport on 01/02/2024 for 4 days. On collection of the vehicle I did a quick visual inspection and reported my observations to the Avis attendant who walked around the vehicle with me and noted the minor snags. On returning the vehicle on 04/02/2024 at Avis/Budget ORT, the attendant pointed out that there a scratch/dent on the lower RHS door. This was barely visible and may have been missed when collecting the vehicle. I confirmed that I did not have any incident or accident which could have caused this damage which was noted on the checklist which I signed. Whilst in the boarding queue I was called by the attendant on my cell phone informing me of further damages, which when returning the vehicle I nor my passengers did not see or were aware of. On 6/02/2024 I received a SMS stating I am being billed for damages to the tune of R7784.78. My subsequent emails to *** querying and disputing this have gone unanswered. But on 23/02/2024 my bank account was debited without my consent/approval to the amount of R3174.81. I have had no response to my inquiries to the above email. I have again received an SMS claiming I owe them another R5777.70. My deposit has also not been refunded. I am very disappointed and concerned of the ********* business practices of this well known corporate company.