First file a complaint against the lawyer in the Bar council of tamil nadu.
You should file a complaint u/s Complaint under Section 35, of the Advocates Act.
Along with the complaint an amount of Rs.1500/- to be sent towards complaint and process fee. The said amount of Rs.1500/- can be sent either by way of demand draft obtained in favour of “BAR
COUNCIL OF TAMIL NADU” or by Money Order.
The complaint format can be done by checking the website or through a court clerk or through a lawyer.
I am sad that a fellow lawyer has done this and feeling extremely sorry.
Hope this helps.
Contact address of the State Bar Council: Secretary, Bar Council of Tamil Nadu, Bar Council Buildings, High Court Campus,Chennai - 600 104, Tamil Nadu.