As a warning to any travelers choosing to dine at Live Rock Cafe in Parana, Entre Rios, Argentina: Someone in my family left her credit card by mistake, when paying for her meal. She realized her mistake within about a half-hour and called the restaurant. She was assured the card would be dropped off at her hotel. Yet, when she checked her bank account online, she noticed that someone had already charged the card for a hotel - a hotel that just happens to be across the plaza from Live Rock - within a half-hour. When she returned to the restaurant, she was treated with indignation the moment she walked in. The personnel did not simply deny any wrong-doing, but implied that she "deserved" it.
By the way, the girl is from Parana. If they'll do this to their "own", what makes you think they won't do it to you - a traveler from another country?
Don't patronize these criminals. There are plenty of good restaurants in Parana. Scratch Live Rock from your list. No one deserves to be robbed - regardless of the imagined reason.