Cancellation of an off-plan property while an SPA is not signed and the project is completed

I booked an off-payment plan in 2016 for a residential project in Dubai.

As per the booking form, the expected completion date of the project was Dec 2017. The project was completed recently in Feb 2021.

I paid 30%in installments and the remaining, 70%, is due for payment now at the time of handover.

I only signed the booking form in 2016. Neither developer initiated the reservation agreement and SPA nor I approached the developer till 2019.

I did not approach because I was not aware of any such documents. Due to significant project delays, I applied in Jan 2020 for a request of refund.

Afterward, I continuously followed up for the whole year. Now, they sent me the final notice that the project is completed and if I do not pay the remaining amount within a month, then my unit will be canceled.

I would like to ask:

Based on the above facts, what are my legal rights to claim a refund or compensation as I don’t sign the SPA and I already paid 30% of the amount to the developer?