What to do in his regard?

This man took 9900 from me and promised to do a pooja for the negativity removal from my love life and said the guy will call me back in three days. But it never happened. Then I called him after few days and he never returned my calls or texts. One day he did pick up and said he wants more money as there is some problem. I never paid him after that. he then told me there is nothing he can do now but asked me to wait for 15 days more. Again nothing happened. I then asked him to pay me my money back and he asked for 20 days and until now he has not returned my money. Now this man is threatening me saying that I will get a response soon when I said I have complained against him. I want my money back. I received a message from this other girl who has also paid him 3500 and he told her the same story. I have seen reviews against him on this complaint forum and he is a big fraud he has taken big amount of money from people. If investigated he will turn out to be a big fraud just like the rest of the babas and gurus of our country. Kindly tell me what to do?