>>105630894Taking a screenshot of the chat log.
At least in my country, a company is forced by law to fulfill a business agreement, advertisement etc including what a representative told them through official media. The bot is not a person, but neither the law or the client cares about that.
So let's say there's a banner somewhere saying "buy our plan for 100$" and there is no message saying "valid until X date" someone can take a picture of it and demand to buy that product for that price. If the company declines, they can be sued. So for the company, it's best to avoid the lawsuit and just do what the customer wants.
Of course, business make sure that something like this is rarely a problem. Then comes AI and how completely unpredictable and easy to trick it is. Someone with experience dealing with AI can easily fool the bot to say something bad.
In that specific case, the client took a picture of the website containing the 4yr offer using their phone, while keeping their cursor over a word, while the next word was "free".
This made the AI believe the 4yr plan was indeed free for new users.
You can't really prove that this was done in foulplay, so that's that.