Can I get my deposit back?

We signed a deposit with a builder in WA. Its just the $1500 deposit, no contract as of yet. The deposit was to 'lock in the price' and get the package deal etc.

This is what happened:

The sales rep is a complete imbecile. We met with him, agreed on a plan and then when we got the plan sent to us we found there was no entry to the back yard. He told me it will be fixed when we go to pre-start. I spoke to him and his manager saying that its not the first time I've build and plan changes are not changed at pre-start (especially major changes). But both insisted it will be sorted then. We get to pre-start (2 months later) and get told we cant do the changes here.

Then we go back to the sales rep who sketched in the changes we asked for 2 months ago. We get the plans again and they are wrong. We tell him but he says it will be sorted. Weeks go by nothing (yes, we did chase him weekly). Next thing I know is the measurements on the plan are wrong. Then they say they will not make me deal with the rep anymore. I try to get a paving quote but all the pavers say the plan is not usable. I keep telling them this but they say it is. We asked for them to quote on paving but they said they will only do the front as back of the house is too complicated due to a slight half meter slope on the block. I dont get it, are they builders or clowns?

Every time you try to talk to them they have no idea.

I think the main problem is that the block we have means we need to make variations to their 'off the plan' home (which they said if fine). This is causing all the problems. Its almost as if the homes that are not prefect to their 'shelf' plans are too hard. But at the beginning we were told its all good. Of course they will never admit its too hard but when I asked about leaving them they did not even try to stop us. Almost as if they want us to go but keep the $1500.