Wall Street Cantina - Wall Street

I've attended Taco Tuesday several times, and each time I've gone one of the waitresses charges me for someone elses drinks. When I try to tell them I did not order these drinks they say it was people in my group who left without paying, which was not true, considering my group was all still with me. They've overcharged my credit card twice, and refused to refund me. If you go to the bar and buy one drink out at a time this doesnt happen. It only happens with the waitresses.