Same here! I was forced to have a drink with one girl whom I met at the museum. First, she was so nice, talked and showed me the town and then asked to have a drink in her uncle’s bar. I refused to say that I don’t drink on religious reasons. Then she forced me to come with her to see her uncle.
I was alone, so I agreed. But once we arrived at the bar, it was a night club with expensive drinks. I felt that it was a scam, immediately left and escaped into another small restaurant until she couldn’t find me back. If any stranger trying to buy you a drink, just refuse and walk away. There are a lot of scammers in Istanbul.