Samsung India — Samsung j7 screen blinking

Address:

Gumati, Tripura

I vistited samsung care centre before a month for reparing my fon. They said displays are short so vist aftr 15 days. After 15 days they said same yet short. Finally after a month they took my fon for repare now more than 10 days passed i didnt receved any coll from care centre..
Before 2 months my friend submitted his phone at care centre for the same purpose. He got solution in 24 hours so its requsted kindly solve my problem as soon as possible, because its really too long time to repare a display in 10 days ...i think asembling a new device took too less time as they take in repare ... bill no. [protected]...