Hello dear,

Please read again -> Related Article -> View your purchase history for the App Store, iTunes Store, and other Apple media servicesI

receive an invoice of 32.99 SR, but actually i do not recognise the subscription or the item that i should pay for.

If the invoice is from Apple, check your mail box.

See also this Apple article: If the subscription that you want to cancel is not listed

If the subscription that you want to cancel is not listed - Apple Support

See also the following Apple articles:

Recognize and avoid phishing messages, phony support calls, and other scams

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

If you think your Apple ID has been compromised

If you think your Apple ID has been compromised - Apple Support