A cheaper system may still require training, migration and disruption before it saves anything. If you present only its monthly price, you have not shown that changing is better for the person who must implement it.

Status-quo bias describes an influence of the current option’s status on choice. Samuelson and Zeckhauser found such effects in their decision studies. They also distinguished them from reasons to stay that follow from transition costs and uncertainty.

You cannot diagnose bias simply because someone declines your proposal. Ask what they expect to gain, lose or have to redo, then compare staying and changing on the same basis.