Ordering fruit shakes and giving you a wrong flavor

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I just ordered a glass of fruit shake from a stall in a food court here. I asked for a banana shake but they ended up giving me mango banana instead. I even said it three times that I want banana shake but I think the one who prepared it was deaf or playing deaf (since mango banana shake is more expensive. The one who prepared the shake even insisted that I said mango banana. SO to end it I just took the mango banana shake and went on to avoid scandal and since there were a lot of people too still waiting in line. So tell me what will you do if you were in that situation?