PIP partial success

Hello,
I have been awarded standard rate care and enhanced mobility on PIP for 4 years, i was on high rate care and high rate mobility on DLA for indefinite period just 2 questions really, 1 my award letter says i can prepare and cook a meal unaided this is not true i stated on my PIP application i have all my meals cooked for me and told the assessor the same thing, 2 the award for 4 years seems wrong to me as the doctors letter and other documents i sent with the claim clearly states that my condition is degenerative ......what is the amount of people being downgraded after a mandatory reconsideration and is it worth me making a mandatory reconsideration call.
thhanks