Definition: selling one thing, but delivering another thing (usually of lower value)
Examples:
In the store, the dining room table looked very nice. But the table they delivered to my home was very different — the wood was different, the construction was bad, and the color was wrong. It was a classic bait and switch sale.
Don’t buy from that company. They seem very friendly, but later, you will find the service is very bad. They have a reputation for “bait and switch.”