Lost mobility and PIP

Hi everyone I was assesed by pip two years ago and after being on high rate mobility that paid for car I was told I had to give back my car that I had been entitled to for 17years with indefinite DLA I had been getting for twenty years ,two weeks ago I was assessed again and they decided that I am not even entitled to the lower rate of mobility now and the reduced my money by a hundred pound a month when I got my decision what had been wrote down in a lot of it wasnt what I had told them I am in the process of writing to ask for them to have another look at the decision