Pip awarded but points for wrong descriptors?

Good morning all. If anyone could help I would be grateful. I am an appointee for my son in all matters and had to claim pip again after a first tier tribunal success. I received a call from a nurse who is not a specialist in my son's condition and didn't even carry out an assessment just asked questions relating to a claim from over 3 years ago. I realised there was something not right about phone call/assessment as none of the questions relating to pip or descriptors were asked so I contacted dwp to make them aware sof this. The 'report' was sent to DWP and I received a copy. To say I was mortified is an understatement. I was correct in thinking the report was not based on any of the recent paperwork and evidence I supplied. More calls to DWP and I eventually received the decision award and whilst I am happy with it I am concerned that they have overlooked major difficulties my some encounters on a daily basis. His condition is lifelong and the length of award is in question also. My question if anyone can help is do I submit a mandatory reconsideration as it's only parts of the decision I think are overlooked or do I call and explain what I think needs looking at? I'm so confused what to do as I don't want his award to be reduced or stopped but I would like them to be aware of the difficulties they have overlooked as they are extremely relevant and when it comes to review will they say I should of told them now? Sorry for long post and all the questions I'm just looking for advice on the best course of action.