I had the adventure of pre-ordering an Asus Laptop. https://www.asus.com/us/laptops/for-home/vivobook/asus-vivobook-s-14-oled-m5406/

I found a 50$ off promocode, and placed my order. About 2 weeks later I'm told my order needs to be canceled due to an error on their end. No problem, I'll just order it again.

The promo code no longer works, customer service chat assures me I can just ask them to apply it after I order it. Cool, I'm then told the code is no longer valid. I email their "CEO Office" and after 2 weeks their still "working on it". Compared to HP where I was able to haggle a discount in customer service chat, and then was offered a significant discount when they couldn't cancel an order I placed.

The actual laptop is very well built and fast, but I'm worried if I ever have an issue with it I'll have a horrible time getting it fixed. I'm not upset enough to send it back( mainly since I'd have to wait for the other OEMs to release a AMD 300 series laptop), but I will never buy another laptop from this brand.

At a point it's not even about the money, it's just a really janky bait and switch to sell a product with a discount, cancel the order and lie about being able to apply it later.