Dell — Display not working

After so many complaints and followups the company technicians came and replaced the touchpad, keypad and motherboard but now the display is not at all working because of which i had to face serious consequences in my work as all my documents are saved on the laptop.
The entire laptop along with each and every part is faulty and i want you to either replace the entire laptop or provide me with refund for the whole amount otherwise I will have to take serious actions.