OMG, are you serious, $7,500? AUD
I can't comment in regards to if it's scam or not, I just don't have any facts on the business. That said, no one on the planet could possibly justify charging that amount of money for providing that kind of service, that's just not even a close call.
Being that you've paid direct debit, I doubt there is going to be much that you can do about getting any cash back, but I would still be bringing this to the banks attention at the very least. After doing that, I would approach the business and ask for a refund, if they refuse (which I assume they will do, I would not waste any time in reporting them to the internet fraud division of the AFP.
It may be that they are operating quite legally, but anyone charging that sort of money for that type of service needs to be brought to the attention of the Federal Police at the very least.
I'm sorry for you Julie, I hope you can get some satisfaction from the current situation, but whatever you do ..... block any further payments to them from your account!