Refund of reservation amount paid for real estate property in Dubai

I reserved a unit with Azizi and while paying my first instalment I was billed twice by them. They apologised for the mistake and agreed to reverse the amount within a week but they took more than a month and a half to return my money after repeated calls & follow up.

I've paid the booking amount, the first instalment, Oqood fees and their administration fees. I have only signed a reservation form with them and no terms and conditions have been mentioned about cancellation which I guess should be there in the SPA and not in the reservation form.

I would like to know if it is possible to cancel my purchase at this stage (I have not signed the SPA yet)?

They have not registered my unit online on Oqood as yet so can I ask them not to do this as I wish to cancel?

What amount will be refunded by them if I cancel?

Can the DLD set a deadline with terms and conditions for them to return the required amount so that I get it as soon as possible?

Your guidance will be highly appreciated.