Having a trouble with a solicitor

This is about a solicitor I used to purchase a house in QLD.
The solicitor I contacted put me under an inexperienced girl who was not even a solicitor.
I call her “N” from now on.
[Mistake 1]
The first IP I wanted had active termite problems.
N told me that I would have to spend $2000 ~ $3000 every a half year to treat that.
As I contacted the realestate agent, he got upset and explained that once I put a barrier around the house, which is $2000 ~ $3000, it will last about 10 years, so what N said was rubbish.
[Mistake 2]
I terminated the contract, and the solicitor team took all the money I put for the title search to cover their own fee.
I moved on to another property.
N gave me a wrong stamp duty estimate cost.
[Mistake 3]
After a building inspection, the front balcony floor needed an urgent repair.
She gave me an estimate repair cost of $20,000.
When I spoke to the realestate agent, she got upset and said it would be only around $5,000.
N didn’t check the size of the balcony. After the realestate agent’s call, N changed the estimate repair cost to $8,000.
[Mistake 4]
I asked her to ask the vendor to repair the balcony.
She said “you can’t do that”
But later I found out that I could or at least I could negotiate the sale price. The contract was subject to inspections. Here I lost a big money.
[Mistake 5]
The vendor could not settle on the settlement date because he could not release his mortgage.
He asked me to extend the settlement date. I agreed. But my lender said they have to charge me the penalty fee to set another day.
N asked me to pay for it.
I refused and asked her to ask the vendor to pay for it. She said, “I don’t think so.”
But I insisted. I was ready to settle, but he wasn’t. Who was at fault?
[Mistake 6]
N asked me whether I would agree to release the deposit held by the realestate agent. I said “no”.
N said “that will accelerate to move up the settlement date.” encouraging me to do such a risky thing.
[Mistake 7]
N told me that she tried to recover their professional costs from the vendor due to the extension, but the vendor refused.
I asked her whether I would get charged if I agreed to extend the settlement date, and her answer was “probably not.”
When it settled on 7/June/05, they sent me a bill for the extra professional costs due to the extension.
I sent a complaint to the solicitor (her boss).

After a while, the firm sent me the details of the incomings and outgoings. The balance was 0. (2 weeks ago.)
I assumed that they decided not to charge me for the extra cost.

Today N called me and said,”It’s about your outstanding payment.”
I said,”I sent a complaint to your boss. And I received a letter with all the details and the balance was 0. I don’t owe any money to the firm.”
She said her boss solicitor would call me shortly.
But he didn’t.

What should I do?
Does contacting to the office of Fair Trading help me?