Hi Giselle
I have never heard of it happening, you say that it is documented in the bundle, you could let them have the bundle number as every page is numbered.
DWP do have the right to appeal the decision, we would advise you to seek help from your local Welfare Rights Specialist before contacting DWP; you can find your local Welfare Rights Organisation to help you with advice by clicking on the link below and putting in your post code, it will then come up with a MAP with a list of agencies in your area
advicelocal.uk Gary