TV Troubles

"This TV you have here. The screen looks different than the one I bought from you guys on Friday." A customer complained (It's the only thing they can do competently).
"It looks different? Perhaps your TV is defective or maybe you're not using HDMI cords for a clearer picture."
"Oh, is that it?"
"Could be. If you think it's defective you can bring it in with your receipt and we can replace it with another. We have quite a few of these in stock in the back at the moment."
"Oh, I didn't but this one. It's a different model."
"...This isn't the one you bought?"
"No, I bought a cheaper one on sale."