Hi, my name is jordan123!

Hi @jordan123, and welcome to the community!

It sounds like ESA are in the process of directly contacting those affected, so if you are one of the people who has been underpaid, they should contact you. You could attempt to contact DWP, but I imagine there will be a backlog of other callers enquiring about the same issue. Hopefully if there is enough pressure to rectify the mistake, the issues will be resolved sooner rather than later.

Keep us updated and let us know how you get on!