For personal reasons, I did not lodge my tax return for several years then when I lodged them, My account sent me a tax invoice where he inflated his fee 10 folds then he is suing me to pay it .
I was his client for the last 15 years . I never signed any Letter of Engagement or similar thing with him .
I asked for an itemized tax invoice to find strange items like 3 thousands dollars to read my e-mail which contained the information he asked me about to lodge my tax return although he was the one who asked me to send him the documents by e-mail not in paper form , another 3 thousands dollars to decide the strategy for lodging my sole trader tax return .
One thousand two hundreds dollar to call a lady from the tax the office and double the fee that he used to charge me for each year of tax returns , so at the end total bill is ten folds the usual fee he used to charge me for the previous years as I am his client for the past 15 years .
He told me that the fee of the accountants is not regulated in Australia.
I paid him so far 13 thousands for the work he had done which is 10 thousands more than I should pay him based on his fees in the previous years . I paid that hoping that money would cover the future work as I was not planning to leave him .
He is suing me now because he is saying that the money I paid is not enough.
What should I do ?