Walmart is the worst about this. They must pay inspectors off if they aren't getting blasted for it. When i go to Walmart, i scan just about everything using the APP to check the price. I would say out of 10 items, 2 or 3 are labled incorrect. I recently got the Walmart + subscription (they were running a $49/y special) and it has the scan as you go feature. They are just terrible with their price tags matching the actual price.
But I am not gonna throw a fit and DEMAND someone change the price. If its more than i want to pay, i just won't get it. I have left many things at the register at both Walmart and DG (among others) because the prices scan wrong. But i don't care enough to go through the hassle of arguing a price change, i'd just assume leave it, which is my version of the protest of the wrong price.
I fill out the surveys i am sent by email and i always complain about it, but i have never heard a peep from them.