My lawyer doesn't represent him and wants to cancel the entrustment contract with him. What should I do?

In 2008, my brother entrusted a lawyer of a law firm in Haikou to represent the case, one was a civil dispute and the other was a criminal case, and each case charged 1 10,000 yuan. On the day of signing the contract, 50% (5,000 yuan) per box shall be paid in advance. 50% will be paid after the lawsuit is over. But the lawyer only learned about the case once after receiving the money, and never learned about the case again. He repeatedly called to urge him to pay attention to the case, but he shirked it for various reasons and didn't even answer the phone. Indifferent to the case. In 2009, the parties involved in criminal cases went through "bail pending trial". During this period, the lawyer did nothing, and the civil case was rejected by the High Court in 2009. The lawyer said that he would continue to complain, but he did not give good advice and did not do it. This year, my brother finally filed a case after petitioning in many ways. Now my brother wants to cancel the entrustment contract with the lawyer. What should I do?