I want to refund

I have recently bought a 1 bhk in building laxmi nivas narol Ahmedabad, it is rera registered I have made the full payment back in October including stamp duty and maintenance money, and I even signed the Dastarej documents on October 25th . I was told that possession will be given 1 week from signing dastarej documents but they kept delaying then they gave me possession on November 11th and it was promised that it will be in a livable clean all work done condition , but it was given in such a bad condition with not even basic things like tap, pipes fitted and even finishing and colour was remaining, and at this stage I hadn't received any documents or anything. I only needed to store some items in the flat which they allowed me then I came back after a few weeks and the pipe work etc had been done but painting and finishing on walls was not yet done. I then asked builder and they said it will be done but 1 month we are still waiting. We are yet to receive documents for the property and whenever I ask they say " Tomorrow " And they have been saying same thing for over 6 weeks, I'm unsure what to do as 2 months have almost passed and I'm going out of India work and want to give this property on rent. Is it possible for any refund process as they are not giving documents and making excuses all the time Please let me know what I'm entitled to Thanks