Hi! 2 months ago I bought a full creative cloud pack by student subscription, which was 19.99 USD pro month. Today, after 2 months, I was charged 23 USD. Do you know why it happened?
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That is the normal student rate. For the first 12 months you get a special deal.
I would recommend to contact Adobe customer care for this. Adobe customer care can be contacted by beginning a secure chat session at https://helpx.adobe.com/contact.html?rghtup=autoOpen. Pop-up blockers need to be disabled! If the chat window fails to open, or is non-responsive, use a different device to start the interaction.
Support phone numbers may be found here: https://helpx.adobe.com/contact/phone.html. Please note that phone charges may apply.
(see also here: https://community.adobe.com/t5/creative-cloud-services/how-to-contact-adobe-support/td-p/11875703 or here
$3 increase sounds like a regional TAX increase or currency exchange adjustment to me. Where do you live?