XPS 15 9500, speaker crackle issue

I bought my dell xps 15 9500 last month with huge expectations. Given that this is one of Dell's laptops with higher end specs (and pricing) I was expecting a machine with no flaws.

However, I noticed an issue with the speaker right out of the box. It seems to crackle with sounds such as windows notifications, etc. I contacted dell and kept following up multiple times and finally, yesterday they replaced the speakers in my laptop, only to find out that the problem still persists! The service personnel casually just shrugged and with the least amount of concern, said "I don't know what the problem is, I will try to connect to the dell Centre and let them know". I did not receive any update since then and when I contacted the same service technician again, he says that according to him the laptop seems to be working fine and that the issue comes when the volume level is above 90 (which is not true, it comes at any volume and is noticeable above 30). And in a hypothetical situation if what he said was true, I do not need to deal with the slightest issue after buying such an expensive laptop. In addition to dealing with the dell service call center, I have to deal with arrogance too?

I am hoping to have the system replaced, and at the same time wishing that the new one would not have any of the factory issues( trackpad, screen freeze, speaker cracking, etc.)

Does anyone here know how to deal with this?? Kindly help.

@Anonymous