Pip mobility points question

Hello all  

back in 2014 I moved from dla or incapacity to pip, I recently had a letter from pip saying something about a change in pip law and they’ve checked my award. Nothing has changed for me. However enclosed was a letter showing what points I was awarded back in 2014. I’m wondering about the mobility section, I was awarded 4 points for answer B. I have autism and don’t go out alone due to high anxiety and not being able to communicate vocally. I used to live in a care home before moving back with family and had support doing shopping, phone calls, anything outside or where I needed to communicate in real life. Would I be entitled to answer D, E or F points if I don’t go out alone anywhere without support? 

MOBILITY ACTIVITIES

1. Planning and following journeys.
a. Can plan and follow the route of a journey unaided.  0 points.
b. Needs prompting to be able to undertake any journey to avoid overwhelming psychological distress to the claimant.  4 points.
c. Cannot plan the route of a journey.  8 points.
d. Cannot follow the route of an unfamiliar journey without another person, assistance dog or orientation aid.  10 points.
e. Cannot undertake any journey because it would cause overwhelming psychological distress to the claimant.  10 points.
f.  Cannot follow the route of a familiar journey without another person, an assistance dog or an orientation aid.  12 points.

If I am entitled what would be the best way of trying to get it? I was awarded back in 2014 so missed my appeal if there was one.

Many thanks for your time