Couple of things. If you just unlocked the app, and content still shows locked, first, please confirm the transaction went through successfully by checking your purchase history:
For iOS purchase history: https://support.apple.com/en-us/HT204088
For Android purchase history: https://support.google.com/googleplay/answer/2850369?hl=en
If you can confirm the purchase or the content is just stuck or locked, then, please try going to CONTENT and pull to refresh. This will re-load the metadata and often fixes such issues.
Be sure to force close and reopen the app. How to force close on iOS: http://apple.co/2i1YBd2 | How to force close on Android: http://bit.ly/2hsABAL
If that doesn't work, please try to delete the app entirely and re-download it. Once you've done this, you'll need to re-unlock any purchases you made. Simply go to SETTINGS > RESTORE PURCHASES.
Please let us know if any/all of these do not work.