The Deck restaurant, Springs, horrific customer service. Dishonesty

On 6 November, a visitor to SA had lunch at The Deck in Springs. Upon paying by foreign credit card, in the amount of R457.00 the waitron, a lady with blue hair (which is now dyed white), duly wandered off with the machine and card. She returned to the table and said the transaction was declined. When the patron asked for the slip showing that it was declined she apparently told the customer she had already thrown it away. She requested that the transaction be done again upon which time the transaction went through without a hitch. Then when the customer checked his account the transaction had gone through twice. He immediately contacted the restaurant, speaking to the manager, Jade, who flatly refuse to refund him the over payment, saying they only received the money once, but she would sort it out. To date she has done nothing. In fact, when I spoke to Jade myself, she told me they don't feel the patron is entitled to a free meal if they refund him. The restaurant has made little effort to find out where the missing funds are, blaming the card machine etc. However, no slip of paper showing that the first transaction was declined has been forthcoming. All the client has received is a excel type list of card deposits for that day. No name of the bank, card machine bank or anything else. As far as the client is concerned, the restaurant is liable for the refund of the double payment and its their responsibility to find out what if anything has happened to the money. This is a visitor to SA where dishonesty and ***** are openly discussed in other countries. This matter has proved them right especially since when I spoke to Jade, her attitude is an absolute disgrace. The client wants his refund, which he is entitled to. It's time this restaurant (the Deck in Springs, Gauteng) takes customer service seriously.