Customer requested a diagnostic for his Lexus and his tractor. I clearly explained my diagnostic fee over the phone, and he agreed. I spent about four hours diagnosing them and identified the root cause of each issue. After completing the work, I requested payment for the diagnostic. He initially said he would only pay half and the rest when I returned to perform the repair. I explained that diagnostic fees are due the same day and that I would provide a separate quote for the repair afterward. He refused at first but ultimately paid the full amount (10 minutes of arguing). The next day, after I sent him the repair quote, he became hostile, accused me of scamming him, demanded a refund,said he would file a police report and even threatened to report me to ICE despite me being born in the U.S. To avoid further conflict and wasting time, I chose to refund him and move on. Oh yeah his house was worth 1.6 Million. He also just sold a 1 million dollar gas station and owns many more.