You do not say where you see this purchase. If it is an e-mail are you sure it is real and not an attempt to steal your private information ('phishing') (very common)?
Identifying legitimate emails from the iTunes Store - http://support.apple.com/kb/HT2075
Phishing & Other Suspicious Emails - https://www.apple.com/legal/more-resources/phishing/
Forward attempts to: email@example.com
If you think the charge is real:
If you see ‘itunes.com/bill‘ or an unfamiliar charge on your bank, credit card, or debit statement - https://support.apple.com/HT201382 - "Before you contact Apple to request a refund for a charge you don't recognize..."
Deleting an app does not cancel the subscription if it has one. You must cancel the subscription:
View, change, or cancel your subscriptions - https://support.apple.com/HT202039 - "Your membership or subscription might renew if you don't cancel your membership or subscription more than 24 hours before your renewal date." At this stage the renewal is considered a purchase. For a new subscription the sale is probably effective from when you first agree to subscribe.
Apple's terms of purchase in the USA are, "All Transactions are final" (https://www.apple.com/legal/internet-services/itunes/us/terms.html), but some countries have different laws so check terms for your country at: http://www.apple.com/legal/internet-services/itunes/. If sales are final then it is Apple's decision if they want to grant a refund. You can always ask, and people do get refunds on a case by case basis, but Apple can also say no. To request a refund:
Get help with an item purchased from the iTunes Store, App Store, Mac App Store, or iBooks Store - https://support.apple.com/HT204084
Report a Problem - http://reportaproblem.apple.com - "Sign In for help with iTunes purchases made in the last 90 days"
Other ways to contact iTunes Store Support:
Remember, when you joined this forum it said this is a user based support community. Replies come from other users like yourself and if you wish to use Android it makes no difference to us. What does make a difference is including a threat (even if it isn't to us) automatically makes us see you as a hostile person, and you aren't that are you? 🙂
How is Apple charging you and for what?
Apple doesn't randomly charge people, so etiher you signed up for something and forgot, or someone with access to your credit card information or AppleID has.
Without more information from you as to what you are seeing, that's about all I can say at this time.
Ok, if you received this 'charge' notification in an email, it's probably a phishing attempt: Phishing & Other Suspicious Emails
You can look at your account to see if you were actually charged for a purchase: See your purchase history in the App Store or iTunes Store - Apple Support
If you bought something that you (in reality) did NOT purchase, follow the steps in these two articles:
Question: Why is Apple charging me for stuff I don’t subscribe to??? This happen to anyone else!?