If you are using a mobile device, you can always check your status in your SoundCloud app's settings. If your current plan is not reflected after a successful purchase, you can also go back to the checkout screen in your app, and select "Upgrade now".
If you do not have a mobile device or are using a computer, you can check your subscription status your Subscriptions page.
On that page, you can check your subscription status, its expiration/renewal date, billing history, and plan level.
**On this screen, be sure to notice the difference between:
"Expires on ___" which means you will NOT be charged automatically any further.
"Renews automatically on ____" which means your plan is still ACTIVE.