Charged multiple times on items I didn’t purchased

This is primarily a user-to-user support forum; other Apple users like you. We don't have access to information about charges to your account. Apple has an article about charges — see each of the steps in the following instructions. They include information on contacting Apple Support if the other steps don't help: If you see 'apple.com/bill' on your billing statement - Apple Support

or go to Subscriptions and Billing - Official Apple Support

If the invoice is not from Apple, was the money deducted by a stranger?

Contact your bank, they can find out who (name, address & account number) has collected the amount from your bank account, and when.

Depending on your bank, they can collect the amount back within 30 days.

Ask the bank to block your card, and ask a new one.

Also report to the police.

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For sure check -> see the following Apple articles:

View your purchase history for the App Store, iTunes Store, and other Apple media services

View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support

How apps, content, and subscriptions from Apple are billed

How apps, content, and subscriptions from Apple are billed - Apple Support

If you have received an invoice from Apple, it will be stated on the invoice for what you have to pay.

Tap on Report a problem on the invoice.

Or try to -> Request a refund for apps or content that you bought from Apple.

Request a refund for apps or content you've bought from Apple – Apple Support (UK)

If you have requested a refund, you must wait until Apple has approved. Then you will receive a message from Apple.

Refunds are not guaranteed. For more information, see the Terms & Conditions.

❗️ Identify legitimate emails from the App Store or iTunes Store

Identify legitimate emails from the App Store or iTunes Store - Apple Support