How can I terminate the purchase agreement of a studio for delay in the handover date

Good Evening,

I have purchased a studio last March 2021, I have already paid 30% of 171,000 for the unit.

The handover was supposed to be in July 2021 but unfortunately, it will take more time at least January 2022. No deadline confirmed

I called DLD to check if my apartment is registered but they said they cannot find anything.

I have mailed the developer many times for 5 months but no replies for the registration update.

I would like to check, will it be possible to get my money back if I file a case?

Please your answers are very important cause I am worried.