Delayed project

I am based at Pune and booked a flat in Hyderabad on 31 Dec 2012.I have paid 95% cost along with service tax there on by Jul 2014 all through bank and all receipts available with me. Builder has not given me AOS till date despite repeated requests. Project still under construction and already delayed more than 3 years.Flat is almost ready now but many amenities yet to come. Builder is asking for penalty on delayed payments @ 24% interest but silent on delay on his part. I am willing to pay balance 5% without delayed charges but he is not doing registration without this.I have deducted 1% TDS on 95% amount as flat cost more than 50 L. He is not providing his details to deposit TDS in challan 26 QB despite repeated reminders and charging interest on this amount also. Am I bound to pay this penalty that too at 24% when I haven't signed any AOS ? What about his delay ? Does RERA Telangana cover projects under construction ? Can he force me to sign AOS now to cover up his delays ? Please advise what is recourse available to me as I don't want to delay possession any further and have incurred great financial losses already. Thanks !