Waiters ****ming clients with card machine

We sat down at Southcoast Mall Wimpy for a quick bite. Bill came to R250. I wrote down the R30 tip and total R280. The waitress came with the card machine and held it to me to tap. I tapped the card and as i closed me wallet she gave me the receipt. I didn't think to check, but just put it in the wallet and got up. I was sitting at home and my banking app alerted me of transactions going through. I got charged R380.