GWM not worth buying

I recently bought a brand new vehicle the p series but at 80 and 120km/h when opening the passanger window it has a huge vibration not sure if it's the tyres or something,took it to the dealer I bought it from and according to them everything is in spec and they can't do anything about it I did receive good service from them but as this is a brand new vehicle it is unexpected For 690k I'm currently in the process of returning the vehicle to Nedbank MFC just waiting on a reply from them