stand your ground. I had a similar experience with another dancer earlier this month. He tried to charge me for 5 songs when it had just been 3. I paid him for 3 and told him he was one of the best dances I've ever had, until he tried to hustle me. The owner was sitting next to me by the bar, told him about it, but didn't name names. The dancer later came up to apologize saying that he was tired so he counted wrong. The next night he apologized again and offered to give me a free dance, I appreciate his offer but declined.
Its such a common occurrence to be over charged for songs, that now I always start a stop watch when a lap dance starts.