Sony India — service center charging illegal and humongous price

I have a laptop sony vaio - vpcea16fg. I want to get its screen replaced, but when i went to customer service at haridwar, they said that they will charge rs 20000 for changing just the screen. The actual price of a semi hd screen of laptop today is not more than rs 4500 anywhere. So how can they quote an amount 5 times more than that. When i argued about it than they said its the final charge, either i take it or go.