P.ip being turned down

My son has aspergers adhd and dyspraxia  and needs constant care his just been told he doesn't  qualify for p.i.p we saw the p.i.p doctor and after waiting 8weeks was told claim was turned down my son needs care all the time has anyone  else had there p I.p stopped it's very unfair the way they calculate  the points I'm going to appeal to see what happens  the people doing the examinations  dont have a clue whole system  is so unfair