I canceled a subscription but it still says Active

These support pages provide comprehensive information about how to manage your subscriptions - both from your devices, or from your AppleID account:

Subscriptions and Billing - Official Apple Support

How to cancel a subscription from Apple – Apple Support

If the subscription that you want to cancel is not listed – Apple Support

If necessary, contact iTunes Support for assistance. See the Apple Support articles below for contact information.   

iTunes Support – world wide   -

Apple Support schedule phone call     -

Billings and Subscriptions   -

Apple on Twitter

A little hard to help you when you do not supply adaequate information.

What was the subscription to and was the subscription actually through the Apple App Store or through using another outside, third party subscription service?