Ridiculous double charges

Earlier this week we went to Game in Illanga mall to purchase new hoses for our pool cleaner. At the till my card was swiped and the transaction was approved, after which the till \froze". This required calls to whoever and more people to get involved already. They weren't able to get the till unfrozen and I was told that I would need to pay for items AGAIN and that the original transaction would be reversed. When refusing to do so a manager was called and I was told that I wouldn't be allowed to leave the premises unless I pay again. I informed them that the last time this happened the transaction was not refunded and I had to go in and fight for my money. I was assured that this would not happen"