I got my iphone 6s about 2 weeks ago. I noticed that there's a dust under the screen on the top left corner, also when pressing the display (3d touch for example) it makes really loud cracking noise. I made an appointment then I took it to apple to see those "Geniuses" and waited for an hour for someone to help. anyway they said they can only replace the screen. After they replaced my screen. The new one also has dust (but in different place) and the pressing noise continued plus they damaged the bottom side. What should I do now?