Not sure if you can do it via this way but it is worth looking into:
For Sky Stream puck or Sky Q - Press Home on your Sky remote, then select My Sky at the bottom of the screen.
You’ll then see a screen with your purchases. Select Your products. You’ll then be asked to enter your Sky TV PIN number.
Then follow the prompts to cancel.
In the Mysky app on a phone or tablet.
Go to the TV section, then My Bill section, there will be a section listed Marketplace, under that click on View subscriptions.
You should be able to cancel it there.
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