Firstly go to My Account > Passes & Vouchers on here and cancel the sports pass.
Follow all the steps on screen (approx 4 steps) until you get the green thumbs up message that you have cancelled the pass.
Then jump back to your Passes & Vouchers section to check that a red cancelled message is showing next to the one month sports pass to prevent it auto renewing.
Then on your account go to Settings & Pins and add a payment pin to your account, where this should prevent this ever happening again.
Once you do all of the above, pop over to live chat and explain to them what's happened and ask for a refund.
Open the link below, select the most appropriate category, then pick the nearest topic, then once you reach the final stage of the process scroll towards the bottom of the screen page and click on drop down arrow below Get in Touch to reveal the live chat button.