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Can you elaborate on why you signed an agreement for them to finalize your taxes if you didn't want them to do the work?
If you have email evidence that you instructed them not to proceed with work and they did it anyway and are charging you for it then likely you can legally challenge their claim for fees and their withholding of your financial information.
If you cannot secure their agreement to release the financial information or reduce their fee claim you will have the option of bringing a claim in the NSW Civil and Administrative Tribunal (NCAT) which you can read about here:
This is a cheap and effective way to deal with consumer disputes of this sort and is consumer friendly alternative to court.
Depending on where your accountant has his qualifcations, you could also make a complaint to CPA Australia or The Institute of Chartered Accountants, links to which are here:
Whilst these organisations do not deal with disputes regarding fees, they may be able to assist in dealing with accessing your financial records.
I trust the above assists.
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