Hi Lisa
I expect you got the wrong advice from a Citizens Advice generalist telephony agent or webchat because you cannot be sanctioned at all if you have LCWRA or are ex ESA Support Group.
The DWP are currently holding a feedback survey involving Benefit Advisers and ESA Claimants and I expect the call is to do with that . But if you wish to ignore it go ahead.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems