Dear Jignesh
Each state maintains Civil, Criminal and High Court some Rules of Practice. In Kerala it is as follows:
The Criminal Rules of Practice, Kerala, 1982
Rule 34: Change of Pleader.- A pleader proposing to enter appearance in a proceeding to a party, for whom there is already a pleader on record, shall produce the written consent of such pleader, or where such Pleader, refuses his consent he shall obtain the special permission of the Court. –
The Civil Rules of Practice, Kerala
Rule 28. Change of Pleader.- A pleader proposing to enter appearance in a suit or other proceeding for whom there is already a pleader on record may not do so unless he produces the written consent of such pleader, or where such Pleader, refuses his consent, he obtains the special permission of the Court
The Kerala High Court Act, 1958
Rule 20. Change of Advocate.- An Advocate proposing to enter appearance in a proceeding for a party for whom there is already an Advocate on record, may not do so, unless he produces the written consent of such Advocate, or, where such Advocate refuses his consent, he obtains the special permission of the Court
Ruling: Refusal to return the files to the client when demanded amounts to misconduct. 2002(3)KLT 399, 2002(2)KLJ 296.
You may verify the State Rules for your regional purpose.
The complaints if any aginst professional misconduct of an Advocate you may approach the State Bar Council