OP, if you funded the purchase by card (credit or debit), you may be able to get the bank/card issue to do a chargeback. Important: is the item not as described? Were you deceived about the item being authorised to use in Australia?
If it’s not accredited for use in Australia, you have a legitimate complaint. Not as described or faulty on arrival is different to warranty, so don’t confuse the two.
I hope you’re able to remedy this. And… your daughter should not buy this sort of thing from an online site or from a seller who is not in Australia, not an Australian business with ABN, and not an authorised seller for this item from the manufacturer… with the manufacturer having had the item go through all appropriate tests and accreditation processes. Assuming you can be refunded, put that money towards an authorised scooter.
The risks are far greater than losing $700. Unbranded unauthorised scooters are dangerous as they are NOT made to Australian standards. Even while not in use… for example, if the thing bursts into flames while being charged, and your house burnt down, you wouldn’t be covered by insurance. Property and lives at risk… and whoever purchased it would be deemed the importer, and would be held to be responsible for having it tested to meet Australian standards and go through the costly process for being granted an accreditation mark.
Good luck. Let us know how it goes.
