When the project itself has been shelved the builder is obligated under the law to refund to the prospective buyers the advance amount paid. You should sue the builder in the civil court to recover the amount paid after issuing through your lawyer a legal notice to the builder. The builder cannot escape his liability to refund the amount together along with damages.
You may also file a criminal case for breach of trust and cheating against the builder in addition to filing a case for recovery. Do set the legal process in motion soon as the time limit for filing a case for money recovery has already started ticking.
