A contractor in Kohima took advance but did not do the work what case can I file

Non-performance of a contract after accepting advance payment in Kohima amounts to breach of contract, and you can file a civil suit for damages and recovery. You can also file a criminal complaint for cheating under Section 318 of the Bharatiya Nyaya Sanhita if there was a dishonest intention from the beginning. Under Nagaland Rent Control Act 2015, you can claim damages including the advance amount and compensation for consequential losses. File the suit before the civil court in Nagaland having jurisdiction over the contract. If the amount is substantial, you can approach the Gauhati High Court under Nagaland Rent Control Act 2015 for an expedited hearing.