It depends on your situation.
If you are financially dependent on your parents and they are jerks, you should work on developing coping mechanisms for dysphoria and a supportive, non-misgendering social environment and on becoming financially independent. If your parents are usually pretty cool or you are financially independent, try some combination of the following:
1) Sit your parents down and have a conversation with them about your feelings, using whatever appropriate evidence will convince them. For instance, some parents might need “mental health professionals agree that transition is the appropriate treatment for trans people and misgendering them is wrong”, while other parents might be best persuaded by you talking frankly about your feelings.
2) Every time they misgender you, remind them of your gender. “Mom, I’m a woman.” “You mean ‘Joan.’” If they argue, don’t engage, just be a broken record: repeat variations on “please call me Joan” until they either get bored or call you the right gender.
3) When you get misgendered, leave. Hang up the phone, walk out of the restaurant, say “I am going to my room now,” whatever.
4) If this gets to the point where you don’t want to maintain the relationship anymore, you don’t have to. There is no requirement to be in a relationship you don’t want to be in— even a relationship with your parents. Cutting them off does not need to be permanent; six months of not talking may allow your parents to realize that you’re serious.