Locked by billing popup after trial ended. Can't click Cancel or Change plan. Live chat icon is missing. How can I contact Adobe support to cancel this and wave the fee when all access is blocked?

I recently signed up for a Photoshop trial but couldn't install the app because my computer storage was full. Now the trial has ended, and my account is locked/suspended with a red billing error popup.I cannot click Cancel Plan or Change Planbecause the popup blocks everything. Also, the Live Chat icon is completely missing from my help page. Is there any way to contact Adobe support to cancel this plan and wave the unpaid fee when the system blocks all access?