Bad discriminating service

I pre booked a car and was aware that on collection I have to pay a refundable deposit of R4500 and I mentioned to the guy who was helping with the booking that I don't have a credit card I have only visa debit card and he said it's ok. On arrival the lady who was helping me asked me to go and print out a 3 months bank statement because I don't have a credit card. I went, came back and joined the Q again the lady said I should sit down she'll help me after the customer she's busy with it. I sat there for the whole hour, she was helping 2 white people (male and female don't look like a couple) they didn't have a deposit money so they were phoning different people to help them transfer the money into the girl's account. I thought the lady will tell them to go to the side while they were trying to get some money but nope. Finally they received the money and she finalized their booking, it was not enough to give them the car keys she even accompanied them to the car parking and she took about 10 min. She came back and I gave her the bank statement she looked and said she's going to confirm with her supervisor, ok, she came bank asking a proof of address I said it's there on the bank statement but she wanted another one from maybe a clothing account and I told her I don't have any clothing account but I can retrieve one for my cell phone account on my email, she said ok but you should go to the side to do that while I'm pushing the line and I refused because it was going to take me 2 min to retrieve it, I got and showed her on my phone, she went to the supervisor again and came back and now we waited for the him (the supervisor) he came and ordered her to finalize the booking. Then she debited R5500 and I asked why because it is R4500 she said her supervisor said so because he doesn't trust my debit account, Oh ok but I was not informed. Ok she gave me the car keys and I left to the car parking (alone), when I arrived I waited and looked around for about 10 min for someone who'll help me to inspect the car finally I saw someone afar and I called him, on arrival when I asked him to help me inspect the car, he said to me whatever dents written on the agreement form is correct because the inspection is done by 3 people before they park the car so they haven't missed anything, then off he left me. I was so disappointed because the treatment I got there was different from the previous whites customers.