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All Adobe plans have an introductory price that is good for a year; after the year elapses, the price goes up to the regular price. Teachers and students do get a lower rate than regular customers, but you have to prove that you are a teacher or student. [The price for the first year is $19.99. The price after the first year is $29.99.]

This link provides information on the proof required to verify that you are a teacher or a student. You cannot get the discounted price without this proof: https://www.adobe.com/creativecloud/plans.html#student-teacher-eligibility

However, whether you are a teacher or a student, you still need to contact customer support to ensure that you are charged the correct price. This is a public forum, not Adobe support. Users, including the ACPs and MVPs, can't provide support for account, subscription, billing, download, or product activation issues. Support for those issues requires an Adobe employee. 

Click the following to contact Adobe customer support staff for help: 

https://helpx.adobe.com/contact/support.html

You must be signed in with your Adobe ID and allow cookies in your web browser for this to work.

This is the link to the US website. If you are not in the US, the site should redirect to the page appropriate to the region associated with your ID.

Click the chat icon at the bottom right of the page to open a chat session. Typing AGENT into the chat window should connect you directly to a CSR rather than the AI. Typing BILLING into the chat window may connect you directly to the billing department.

If the CSR refers you to the forums, insist on speaking with a supervisor and keep moving up the chain until you get someone who knows what they are talking about.

You can also search for Adobe customer support using your favorite search engine. This will normally provide you with a regionally appropriate phone number that you can use.

Be aware that because of the pandemic, wait times are far longer than usual due to reduced staff and higher demand. Please be patient with the people to whom you speak. Like you, they are feeling a great deal of stress. A little patience and understanding will go a long way to helping you in your particular situation.

The point is, you only get 1 year at the 60%-off introductory rate.  After the first year, your price goes up.  That's how it is intended to work.   You may contact Adobe Customer Care via online chat to confirm that you are paying the correct amount.

1. With a browser that accepts cookies and does not have script blockers, please log-in to your account portal below. https://account.adobe.com/plans
2. Scroll down to Contact Adobe on the same page.
3. Click the chat icon. Online chat is available in English 24/7.
4. In the chat box, type AGENT followed by enter key and wait for a human.
5. Alternately, phone customer service M-F during normal business hours.
https://www.adobe.com/about-adobe/contact.html