Is it possible to get refund of purchased property from developer if there is no SPA?

Hello!

Last month I found an apartment that is still under construction with a great payment plan. I decided to buy it!

There were several calls between me and the developer and we agreed that I transfer the booking fee.

Note: When I sent the amount no SPA was signed and I haven’t even received a SPA. Nothing has been signed! Neither from me nor from them! The amount is about $18.500.

My passport was invalid too and I needed to make a new one. So they could not register me at DLD also.

Now, I have some problems with continuing the payments and want to cancel the payment plan and asked for a refund. They haven’t given me any answer yet and been telling me to wait for next week, wait for next Friday and so on.

What can I do to receive a refund?

Do I have a right to receive the full amount back as there is no signature made by me & no registration at DLD?

Thanks