How Do You Explain to Your Congressman That It's Their Job to Care About Other People?

I am surely not alone in being insured by the ACA while in remission from cancer. If the ACA goes away and my cancer resurges, without a replacement that also requires acceptance of preexisting conditions, what am I supposed to do?

And how do you explain to congressmen that yes, actually, it is their job to care about other people if that's not something they already know?