Cash crazy lawyer devoid of truthful service to clients.

What to do if a lawyer is unduly cordial and courteous before I sign the vakalat form appointing him as my counsel to argue the case, goes on charging huge cash providing false hopes all the time and finally turns out to be a cheater. How to get rid off him, if he refuses to return the documents to me and starts blackmailing me for having all the secrets of the case entrusted to him.