You should look at the Fee/Retainer Agreement (the contract you entered into when you hired the lawyer) to see what services were covered/not covered under the retainer and/or how additional monies would be requested.
The client needs to review the written attorney-client agreement. That agreement covers the terms of the attorney's representation -- not what the client thought. A client is entitled to an invoice from an attorney within 10 days of asking for one. I assume the client did not ask for one and the invoice was rendered at the conclusion of the matter.
While perhaps unusual and not the best practice, IMO, it is not unlawful to withhold an invoice until the conclusion of a matter or the happening of some event.
The client’s options are to: 1) Pay the invoice; 2) Discuss the matter with the attorney in an attempt to resolve any disputed amount of fees; 3) Institute fee arbitration; 4) Do nothing until the attorney gives notice of the client’s right to fee arbitration and/or institutes a lawsuit.
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You haven't described anything unlawful in regards to your attorney's conduct. I'd review the retainer agreement then speak with your attorney about working something out.
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