If you have the copy of the signed contract (make sure) in which he agreed to provide you a furnished flat then ask him to furnish the flat as per the agreement and if he is not ready to do it tell him that you will be vacating the house due to the breach of the contract by him. If he is not ready to give back the cheques then you should tell him that you are not interested to drag the issue to the court and would like to settle it with him. You may approach the court even for a compensation from him as you have the signed contract for a furnished flat.