Newly Purchased a Week Ago

We shopped around for over (2) months and thought we had finally found a good used car that was being sold by a major Chevrolet dealership. It was a 2010 Chevy Impala LS with just over 93,630 miles. Not even a week later we started seeing the ABS and traction lights on. And it kept saying “Service Traction Control”, “Service Stabilitrak” and “Service Brake Assist”. When we purchased the car we were to understand things like this were covered but now we are at the dealership to have it looked at and after coming in we’re told no it’s not covered. Is this a known issue? I realize as a used car that things are limited but for our first Chevy auto event purchased, this is very discouraging. I don’t understand how this is happening already.