Sharon Chevy scams

I just got a call from the dealership. 21 Silverado just hit 30k and I have now put 2200 miles on it. The baffles inside the muffler are broken and makes a noise over bumps and while hitting brakes. They are saying $1200 to replace the muffler and fix properly. 2200 miles and my bumper to bumper platinum doesn’t cover! Sharon Chevy in Clay NY are scumbags!! I buy multiple vehicles from them out of convenience and always end up with regret! Terrible customer service, attitudes, and all around ****ing dirtbags!