Phone Junction Pietermaritzburg Pretended they can fix the phone

We went to fix the phone here which had a problem with the screen. We paid the amount they told us. They changed the screen but the phone came back the same despite the fact that the screen is changed. When we took it back they said its was the engen that is damaged. They said they can't do anything we need to take the phone back to the manufactures. They should have told us this beforehand they pretended they can fix the phone