I got charged $17.99 on 29/5/17

See this link to identify phony purchases claimed to be made in your account:

https://support.apple.com/en-us/HT201382

See this link to identify an email purporting to be from Apple:

Identify and report phishing emails and other suspicious messages - Apple Support

See this link to report fraud to Apple:

https://www.apple.com/legal/more-resources/phishing/

See this link to manage your actual monthly purchases and reoccurring charges:

View, change, or cancel your subscriptions - Apple Support

See this link to see your actual purchase history:

See your purchase history in the iTunes Store on a Mac or PC - Apple Support