You said earlier "Last October, I had a compliance interview where the officer stated that the review was based solely on my savings." The investigation has now escalated and looking at the previous posts you have made I think you are best advised to get some personal help regarding this issue from a local Welfare Rights organisation or Citizens Advice. Maybe other members can share their experiences on this subject though a lot depends on the individual DWP investigating officer.
David
Nothing on this board constitutes legal advice - always consult a professional about specific problems