Q: Netflix subscription multiple charges in one month?

Are both debits on the same date ? You've checked your account's purchase history and subscription section, does the app only appear once ? If it only shows once on that account then do you have other iTunes accounts, or are you an organiser in family sharing and a family member is also subscribing ? If it shows twice on your account can you turn one of them off ?

To contact iTunes Support about it either use http://reportaproblem.apple.com or the 'contact us' link at the bottom right of every page on here