I know that I should have looked better into it, however I suppose that what I was subscribing was just a lightroom package. And apparenly also other adobe users have had the same issue when subscribing, as I can see by the suggested conversations.
Thanks for helping me
By @Carlo28943770xsdo
I can see, why people tick that check mark!

And I know that other Adobe users have the same issues. But that changes nothing to the fact that you have signed up for a stock subscription. And you did not read the terms and conditions.
Normally, however, the customer service acts sensibly here and does not try to alienate customers if the stock offer has not been used up.
Moreover, I have now checked the customer dialogue on the website again and found that Adobe has changed the dialogue a bit, and it is more obvious to the customer that you are buying a service.
For your information, I have a third lesson for you, one that I too have learned the hard way to follow: Check your credit card accounts daily or at least weekly or at the very least monthly for unexpected charges. I get a message, when my cards get charged in real time. So, any message of an unexpected charge, I have the opportunity to check that.
One additional tip: if you are located in Europe and your main language is not English, Adobe offers for many languages support in a local language. That support is, however, only reachable during office hours.
You're welcome.