Potty training help

Okay so my son is now 3 and I have introduced potty training twice before and they went okay with some accidents but I stopped both times and went back to diapers for different reasons including the weather being too cold and he kept getting sick and also having to travel a lot. So now I am determined to potty train him FOR GOOD. The only thing is this time around, he is telling me “no peepe in potty” and he will not want to come when I tell him too, and he will also not want to do anything when I sit him down on the toilet. Then when I go check on him he has poop or pee or both in his pants. He doesn’t care for treats or rewards or anything. I know he will eventually learn but any tips you all have would be great! Thank you!