Blank Screen - Cellphone

I bought Samsung Galaxy j1 around May2017 it has been giving me screen problems from 1st week, and I misplaced my Slip but from what I know the Service Provider is able to check when was the Purchase of that cellphone.

Personally I would encourage people to Buy Galaxy J1 as it has this Common fault of Blank Screen, I have been asking people who are using this Model.

Now the Store (Vodacom Express in Phuthaditjhaba) they want to charge me R 1200 to fix the screen, their service is very poor because they are not will to go extra mile to assist me to retrieve my purchase.

as for Samsung I bought that phone hoping that I will get my Cellphone repaired