Legal notice required before filing RCR ?

Hello, Got married a year n 4 months ago. After 3 months she left my home saying I don't take her out (which is false). Later got to know real reason that she was having affair. Relatives n me tried to convince her. But in meeting she told stories that we never mated (false again) n I'm gay (false again) so she doesn't want to come. After that meeting 10 months gone in silence. Now that more than one year is over, we approached for mutual consent divorce, they asked ransom (nothing was given or taken in marriage, still...) We conveyed that we won't give anything. Now, they are playing games, saying she's ready to come. Met a lawyer, he's suggesting to send legal notice first then only we can file RCR n then she'll not come actually n then we can file divorce case... Or they may get ready for mutual consent divorce. Please suggest whether RCR can be filed directly (in court) or need to send legal notice (from lawyer) first ? Thanks in advance.