Stock Credits Disappeared

To contact Adobe customer care, I suggest, you try the chat option: 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)

Stock subscriptions have a credits rollover for unused assets of up to a year's credits. So, with a 10-assets-per-month subscription, you can accumulate up to 120 credits. And you can't go to lessen your credits, except if you license items.

However, if you have acquired credit packs, you need to use them in a year time frame, as they expire after a year.

I guess my spelling isn't so good at this point. I have been on hold to Adobe for 3 hours and 51 minutes!