[jt0]

I'm sorry to hear about these bad outcomes from misunderstandings. One useful tool I picked up from Nonviolent Communication (NVC) that might help you is to request the other person repeat back in their own words what they heard you say/request. It definitely feels clunky because we don't typically ask this of people. Proactively as the listener you can offer to summarize the thoughts or request of the speaker to make sure you really received what they were saying, and ask if there's any part of it they want to clarify. "Let me make sure I understood you. What I heard you say was..." Maybe a useful analogy is to think of it as the md5sum of the exchange. I don't tend to find arguments clarifying because true listening breaks down (further).