Anyone have advice for firing clients?

So close to just blocking this customer, they own multiple properties and did the classic if we’re happy we will have more work. Gave them a 20% off promo I was running from February even though it’s months later. Get there and they decide they want to do the insides themselves since they are clean freaks and didn’t want me in their house. They are penny pinching with 2 Mercedes in the garage 😭 Anyone have any advice for cordially taking people off the client list?

So close to just blocking this customer, they own multiple properties and did the classic if we’re happy we will have more work. Gave them a 20% off promo I was running from February even though it’s months later. Get there and they decide they want to do the insides themselves since they are clean freaks and didn’t want me in their house. They are penny pinching with 2 Mercedes in the garage 😭 Anyone have any advice for cordially taking people off the client list?