Bait-and-switch

Form of fraud used in retail sales or in other contexts

Bait-and-switch is a form of fraud used in retail sales but also employed in other contexts. First, the merchant "baits" the customer by advertising a product or service at a low price; then when the customer goes to purchase the item, they discover that it is unavailable, and the merchant pressures them instead to purchase a similar but more expensive product ("switching").

This keyword could refer to multiple things. Here are some suggestions: