I ordered an iced green tea having never ordered i...

I ordered an iced green tea having never ordered it before. I didn't like it and asked that they exchange it for a different drink and they refused saying I'd have to pay for another drink. I've never had a business not guarantee a customer is satisfied. I asked to speak to a manager and the guy said there wasn't one there at the time. He looked like he was working by himself. I'll think twice before ever coming back to this place.