How to file complaint against lawyer

Dear Sir, I am trying to recover my money from a friend, who has given me 70% of total sum amount and now for rest 30%, he has said to his dad, who is lawyer(B. Naganhalli) in Gulbarga, and his dad says to go and file a complaint in court, since am lawyer i shall put harassment charges inreturn to you, he has been very rude and acting as if he is the law and can do anything to anyone and speaks very rudely to my parents when requesting to pay us back the rest of the amount for medical treatm