Do not mistake declining your solution for refusing to solve the problem.
GRATITUDE
GRATITUDE
Rejecting a solution is not the same as rejecting the problem. Your fix may collide with something you cannot see, cost more than they can spend, or have been tried already in a version you never heard about. Hearing a no as unwillingness ends the conversation exactly where the useful information was about to appear.
Ask what makes your suggestion unworkable, and take the answer as data rather than as an argument. Find out what has already been attempted. Then either adjust the idea to fit the constraints or accept that they know something about their situation that you do not.
Whose refusal did you hear as indifference to the whole problem?
Free, with nothing to buy inside it.