I agree with Mr. Brinkmeier, you have to read your contract. It seems you thought the contract was "pay me $2,000 and that will get the job done." But the contract probably doesn't say that at all. Good luck!
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You need to re-read what you signed and address your concerns with the attorney you retained.
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Generally, a retainer is not a cap on the amount that can be charged. Look at the retainer agreement. Unless it was a "flat fee" retainer ("I will do X for $Y") the retainer amount does not necessarily act as a cap on fees.
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