Poor customer service

I got the Worst experience from the Johannesburg South branch. I bought a Toyota camry and was assisted by a guy named Ruan, firstly he kept us waiting for hours without the decency of any communication then when I made the payment I deposited an extra amount to cover the bank charges and to be on the safe side he then told me that the payment I made was over and above what I was supposed to deposit he then told me to send my bank details so he can submit them for a refund, it's been a month now texting and calling to remind him but he keeps on ignoring me. He has such a poor customer service.