Did you cancel the subscriptions at least 24 hours in advance of their renewing?
For pending charges you have to wait until the step clears and then also make sure you have some way to pay for the items. Apple may not let you download additional items if you still owe them money (regardless of what you think is right or wrong). Once you have paid you can request a refund, though they are not guaranteed.
Click here to Report a Problem or ask for a refund --> https://reportaproblem.apple.com/?s=6
To contact Apple, refer to this page for Apple Support for different countries ➔
Choose your country or region - Official Apple Support
Select your country (if you do not see your country, also look for "other" in regions; e.g., "Other Africa"), then "Choose a product". Click the "show" item under each category for more selections. If you don't see one that handles your issue then keep experimenting with selections until you reach one that gets you a chat session or a telephone call and get the representative to redirect you.