And I thought 15TL for a beer was excessive. 1500 TL is unbelievable, but if you don´t look at your credit card slip carefully, or assume 1500 is 15.00, then you will have problems.
Like you should do everywhere, always check your change in front of the cashier after handing over larger notes. I was short-changed the other day, but if you leave the shop, and then check your change, it´s too late. I do it in Australia, but I was in a hurry in Istanbul, and was caught out. I assume it was an accident by the cashier, which can happen anytime. I´ve learnt my lesson. 
The problem here is they really want 1500 TL from you for two beers in some bars in Turkey. Somebody comes when you wander around on the street and he says you that he knows a good place to drink something. And if you accept to accompany him, he takes you to one of bars which he has an agreement with before, then after you drink a few beers he disappears and the personnel in the bar force you to pay 1500 TL. In short they rob you using force.That is so sick and barbaric. Sometimes I hate my humanity when I read this kind of news.
Some things are more clear now for me,I gonna find some new examples to try translate them.