Fiat Panda 1 month young and first problems

Hello Fiat driver, recently had a longer ride behind me, 900 km highway. I did also well before the 1500 oil change and I always drove 130 kmh (could not drive it out yet). Now probably the back bearings are gone ?! The engine is always idle, I step the clutch is the stupid noise away. And the exhaust now pulls air somewhere, by the way something is loose in the underbody. Sometimes you hear while braking and drive on. What do you mean I should go to the We rkstatt or rather not, what does the contract workshop say about it? I just mean, the car has just been bought and it is not as quiet as on the first day…. Gruss js-js