Nice Try...
You will never prove that a black hole exists...
Let’s stop calling fantasy science...
Every astrophysicist knows it’s a theory and not fact...
All models are wrong; a very small number are useful. Theories, physics formulas, climate models, and other religions, are man-made simplifications designed to fit inside human brains, so it's a given they are all wrong. An embarrassingly small number of them have predictive value. You can devote your life to improving a model, but never perfecting, if that's your calling. Or you can just accept some of them as good enough, and spend your very limited Earth-time elsewhere.
OJ 287 is a very convincing case for the black hole Theory. Every 12 years you had 2 seemingly random events of extreme Brighting. By using General Realitivity and the predictions it made for black holes the last outburst was predicted to within 15 minutes.