Cars Q&A

Hi , I live in Bangalore and recently bought a Mumbai registered car from a used car dealer in Mumbai. He showed me the car papers at the time of selling and told that he will get me the NOC from Mumbai rto in 10-15 days. Its been more than two months now and I have not received the NOC. Whenever I call the dealer either he dont answer the call or make some excuses and says it will take 10-15 days. I have done all the payment but have only Insurance paper and photograph of RC card. What should I do now. Legally car still belongs to the original owner. Can it create a trouble for me in near future. What actions I can take against the dealer. I live in Bangalore so its a bit difficult for me to go to Mumbai every time. Kindly suggest.