i want to cancel a subscription which is wrongly purchased

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

Just move to Settings->AppleID->Subscriptions and then cancel the subscriptions you don’t need

dhrubajyoti80 Said:

"i want to cancel a subscription which is wrongly purchased"

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Refer to the link provided atop this post.