Have been double-charged for the same reservations. What is the customer service email for complaints?

Discussion created by sduck on Jul 8, 2016
Latest reply on Aug 1, 2016 by jsucool76

I stayed in The Lexington New York City, Autograph Collection-Marriott Hotel around two weeks ago and recently have discovered that the hotel did charge me twice for the same reservations. However, I could not find a proper email on the web for addressing this issue. Where and whom should I write to?