First, why they are replacing you is based on the belief that these people are the better deal. Changing a belief is harder than changing an attitude (being abl

First, why they are replacing you is based on the belief that these people are the better deal. Changing a belief is harder than changing an attitude (being able to spot an attitude vs a belief is a real challenge). So, anything can do or could have done would need to change the client's belief that you are replaceable with these competitors. Like other comments suggest, stay in touch. Staying/acting professional will gain you more than being salty/smart.