What state of Australia?
How much is the contract valued at?
How much work has this company done so far?
What are the confusing things you have been told?
South Australia. Contract value $21,125, but $700+ already spent on Council fees and so on. The Company has measured and quoted, no actual work done on site.
I was not told that a nearby garden bed had to be relocated in order for their panels to be installed until quite late, months into the waiting time. In order to do so I am trying to replace the retaining wall at their request (at 67yrs, in the heat), personally dragging sleepers, digging soil and barrowing, laying cement blocks etc. This could have been done earlier in the winter if only they had told me, and I would have had more time to work. They have offered to delay the contract to next year, but that doesn't help me in this heat, working alone and no way to get help. They have also offered to make the 'room' narrower, but that defeats the original purpose.
Okay, thanks for that additional information.
As the contract has been signed, and there hasn't been a material breach on their part, I think you would have difficulty getting the contract set aside.
Accordingly, your best bet here is to see a lawyer yourself (as they seem to be prepared to sue you over this), and have your lawyer write their a letter stating your concerns - ie. the relocation of the garden bed.
As there hasn't been very much work commenced so far, they may be willing to abandon the contract, or at least make signigicant concessions.
But you have to understand, in my view, based on what you have said above, I don't think you're on the strongest footing here. Fenwick Elliot and Grace are a decent Adelaide based construction law firm who could probably assist here if you don't have a lawyer of your own.
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Lawyer
I did my law degree at the University of Queensland, and am a practising solicitor in Brisbane.