At this stage of the process there is little extra that you can do, providing you have again shown that you meet the criteria for an award, then there should be no problem. See the PIP Claim guide for further information.
There are currently significant delays in the PIP assessment process so it could easily be another 12 weeks or more before you hear anything more about your reassessment.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems