If there is no contract and there is no invoice for remittance, which is completely illegal, you can directly ask lawyers and law firms for a refund.
If it can't be solved, complain to the local lawyers association or bring a lawsuit to the court, and lawyers and lawyers will be the same as defendants.
To find a lawyer, you should sign a written contract with the law firm and ask for a formal invoice before paying the fee. Regular lawyers and law firms will voluntarily provide the above information.