Bait-and-switch

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"). Applicable outside of retail spaces by unscrupulous men

“All he ever did was bait and switch, promised the world but all he ever had was a bad attitude”