How do i cancel a subscription

The Complete Guide:

▷ Follow these important steps.

▷ Call 1-800-MY-APPLE.

▷ Learn how to file a claim.

▷ Get Support.

▷ Download the Apple Support app.

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If the subscription isn't billed through Apple:

Don't see the subscription when you follow the steps to cancel your subscription? You might have purchased that subscription from another company.

On your bank statement, find the charge for the subscription. If your bank statement doesn't say Apple, apple.com/bill, or something similar, Apple doesn't provide this subscription to you. To cancel the subscription, contact the company that offers the subscription to you. Statements often list the name of the company, such as Hulu, Pandora, YouTube, Amazon, HBO, etc.

Resources:

▷ View Purchase History.

▷ Cancel a Subscription.

▷ Billing and Subscriptions.

▷ Returns & Refunds.

▷ Request a Refund.

I lost my device i m trying to cancel my subscription how do i do that

You can do it from a computer (macOS or Windows PC), see See this Apple article: 

How to cancel a subscription from Apple

How to cancel a subscription from Apple – Apple Support (UK)

Scroll to Cancel a subscription on your Mac or Cancel a subscription on your Windows PC or other device.