Hi, my name is L76! What will happen if childs details aren't changed by tomorrow?

Hi I have a question about my Universal credit. I have recently had my oldest child's payments taken off my account because I hadn't updated there education status. I have changed this the day later to still in full time further education.

Im currently waiting for U/C to update my payments back to the original payments. They have told me there waiting to have my child verified by another department. I have been waiting over 2 weeks for this to be verified? I was told this should be completed by 19th which is tomorrow.

What happened if this still hasn't happened by tomorrow?