Hi, my name is Openbox67! Will overpayments affect my ESA claim?

I’ve just been told by the DWP that I owe them nearly £28,000 which they have overpaid me because I never told them when my 2 sons turned 18 years old our child tax credits automatically stopped at the time this all happened in lockdown my 2 sons still live with us but are both are now working so how can this affect my ESA benefit claim