I have purchased a Flat from a Promoter by taking a home laon from a bank. I have made the full payment as per the agreement value and my deed is also get registered. At the time giving the possession i have threatened by the promoter to provide extra payment of 1 lac rupee , which i have paid by a cheque. As per the understanding i need to pay him this amount in cash later and he will return the cheque. I need advice what i need to do so that he can now return my cheque back to me or if he deposits the cheque can i give a stop payment instruction.