Please check that you have received a receipt for it and that it has not been subsequently cancelled. If you haven't received a receipt or you have received a cancellation, the payment will not be taken (though this sometimes takes a couple of days to become evident when paying by card).
If you have received a receipt and no cancellation, please do feel free to post in our bugs forum: https://community.sigames.com/forum/593-football-manager-touch-2018-bugs-forum/. It is important that you tell us whether you have Cross-Purchase enabled or not.
Do note that we may advise you to contact Apple/Google in the case of store billing issues as all transactions take place with them via their servers.