An employee took me by surprise, attacked and verbally accosted and threatened me at the cash register on an hour-long shopping trip in view of several other employees and customers and in the presence of a store-manager. They complained that I abused all the employees since I had entered the store and that they weren't going to tolerate it any more.
They would give me no details. Interesting, because I was having a good experience until I got to the cash register. They also threatened to call the police to have me removed. Higher management was initially apologetic with my complaint until the employees in their defense villified and disparaged me, saying I was a chronic problem.
I returned items too many times (3) and reported overcharges on my receipt too many times.
Customers beware: you are not only "always right" you are entirely wrong if you report their unprofessional behavior and the overcharges on your receipt. Worse, higher level management goes along with their "kill the messenger" tactics.