Missing my dad with schizophrenia

F 19 , For the past 11 years my father has been suffering with schizophrenia. He’s never been involved in my life and I wish the best for him, but he makes no effort to seek help when me and my family try to help him. He believes his medication is poison and when you try to tell him otherwise he thinks you’re being manipulated. It’s gotten to a point where he moved away (he’s in dubai now on some mysterious income) He spams me and my sister with calls and texts, mostly unintelligible sentences rambling about elon musk or tesla or cryptocurrency. I haven’t responded in over a year despite his countless calls and texts, I just cannot bring myself to want to get into contact with him. I’ve stated before I don’t want to speak to him until he gets back onto medication but he thinks I am “being manipulated”. It really hurts sometimes, and I really mourn the dad I could’ve had in my life. I’m curious if someone else is going through a similar situation to mine. I’m worried i’ll end up regretting it, I just really miss my dad.