Experiences in Italy

My first experience spent a day to Florence. I was with Ona, Irene and Alex. We went to one bar, and I order coca cola and one coffee. When we had to pay the waiter, they told us that the coca cola cost 8€.we believes that he was making a joke. We had to pay a lot of money for only 3 coffees and one coca cola and finally the waiter didn't return us the change. We get angry and we went out without the change.