Hi John,
Welcome to the forum. On the assumption that you are also new to the site you will find this link helpful -
Welcome to Benefits and Work Both ATOS and DWP have huge backlogs and many reassessments have been suspended. We have some members who are more than 12 months beyond the date they expected to be reassessed. Your ESA payments will continue until a new decision is made, however long that takes (as long as you do everything you are asked in the time-frame stipulated).