At https://stock.adobe.com while signed in, you will see your available quota:

As the site is responsive, the upper information may not be available. However, by clicking your avatar, you will be able to see the available quota.
By clicking "Manage Account" you can manage your subscription. When cancelling, you will lose unused assets, licensed items will stay. Early cancellation will trigger an "early cancellation fee" of half of the remaining due, except for the first 14 days of your first paid month. For cancelling, see here: Cancel your Adobe Stock membership.
You may also contact Adobe customer support. 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
https://community.adobe.com/t5/account-payment-plan/how-to-contact-adobe-support/td-p/11843852)