Something I canceled of my subscriptions still charged me before the trial ended

I purchased a free trial and I cancelled before the trial ended and I still got charged for something I don’t have in my apps anymore I didn’t want the free trial so I cancelled the subscription before the 5th of February and I deleted the app on the 30th and yesterday I got the charge for the $5.35 and that’s not fair honestly so I hope I get a refund for this. Thank you