Hp mini damaged

i have an hp mini laptop my kids terribly damaged it the caps on both side are broken and lost and the wiring below them is also damaged the laptop wont turn on the casing is with some many scratches and cracks that i want to get it changed is it possible? i tried to get it fixed but the guy even made it worse please can you guide from where can i get it repaired and how much will it cost and is it possible to change the whole casing? and sorry i dont know much about these things