Hello- i'd like to cancel my extra 50GB of Icloud storage plan. It is .99 per month

AFAIK, storage subscriptions should show up there.

But, if you have a problem with a subscription or a purchase, see Subscriptions and Purchases https://support.apple.com/en-euro/billing. If you think you may be able 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=23362Be patient; sometimes you can't get immediate telephone support.

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.

__________

You also can look at your purchase history. See your purchase history for the App Store or iTunes Store https://support.apple.com/en-us/HT204088

See if anything here helps.

Downgrade your iCloud storage.     

See View, change, or cancel your subscriptions https://support.apple.com/en-euro/HT202039