XFACTOR
They may be contacting you to clarify the content of you MR letter.
My advice is to take the call, I can't remember anybody who has changed the Decision by entering into written correspondence with the DWP, wherever members have reported similar circumstances and not taken the call, the original Decision has been upheld and they have had to go to appeal.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems