Don’t see an option to cancel a subscription

This means the subscription has already been canceled, and it wont renew. When you cancel a subscription, you can still use it until the next billing period.

So, if you had a 7 day trial, and one day 3 you canceled the subscription, you still have 4 days to use the subscription, and you wont be charged after the 7th day.

If you didn't do so, try using See or cancel your subscriptions https://support.apple.com/en-euro/HT202039. If this step does not work and your still have your subscription problem, see Subscriptions and Purchases https://support.apple.com/en-euro/billing. If you think you need to to get a refund, then use the request a refund link. It will take you to Request a refund for apps or content that you bought from Apple https://support.apple.com/en-euro/HT204084

See How long refunds from the App Store or other Apple services take https://support.apple.com/en-us/HT210904

You also can get Apple telephone support for help in solving your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362  Be patient; sometimes you can't get immediate telephone support.

You also can use Apple Support Twitter  https://twitter.com/AppleSupport. There may be an hour or so wait.

And here is how to contact iTunes worldwide support via text or chat using this link https://support.apple.com/choose-country-region/itunes. After choosing your country, see the heading Tell us how we can help.