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Frank Gruber, CEO and Co-founder of Tech Cocktail, and Travis Kalanick, a longtime Silicon Valley entrepreneur who runs online car service Uber--and is a Groupon client--responds to the company's presentation at SXSW, taking the opportunity to call them out for shoddy service.

Sunday's Groupon panel on the Fast Company and PepsiCo stage took an unexpected turn when Travis Kalanick , a longtime Silicon Valley entrepreneur who runs online car service Uber , spoke frankly about his negative experiences as a client of Groupon --and several Groupon staffers in the audience took issue with the story he told.