What is the evidence from the Qur’an and Sunnah regarding the lawyer’s entitlement to the stated fees, and the injured party’s entitlement to compensation due to the error committed by the lawyer?

The notary and scribe are trustees; they are not liable for what is in their keeping unless they overstep their bounds or are negligent. A clerical error is not considered negligence unless intent or collusion is proven. Therefore, the notary is not liable for damages resulting from a clerical error, and the client must pay the full fee to him, as it became due upon completion of the work.