Today I was charged 4.99 euros.But I haven’t purchased anything
Why was I charged?
AJKH,
First determine if it is a real charge on your account, or just a scam phishing message trying to scare you. Phishing messages falsely claiming that you have a charge from Apple are unfortunately very common.
But if it is a real charge on your account, follow the steps in here:
If you see 'apple.com/bill' on your billing statement - Apple Support