iCloud Photos missing after payment cancellation

Photos were backed up, but now are missing from iCloud.

I even made sure they stayed there, i deleted the photos on my iPad and then checked on iCloud if they were still there and they were!! So it was fine, until today. A lot of my photos are gone and they're not in the deleted folder or anywhere. It's so annoying... Is it because my payment was cancelled? If i buy iCloud storage again, will it fix the problem??