Humair Ali

Hey guys, I wanted to know if anybody else is having this problem on the 2017 Civic. When I drive on the highway going over 100 km/h I hear a rattling noise coming from the passenger side AC vent. It becomes more prominent at faster speeds. I can also hear it occasionally on regular roads (<100 km/h) on windy days. I hear it whether the AC/Fan is on or off. I have already gone to service center and they said it was gravel hitting the mud flap of the passenger wheel and the noise is carrying through to the vents. I call BS on that. I have less than 600 Km on the car. This is my first car so I really don't know what to do. Should I keep going back to the service center until they isolate the issue, can I exchange the vehicle out of another? Any advice would be greatly appreciated.