OnePlus India — I have not received my order

I have ordered a product from oneplus store on March 14 with order no. M[protected] but the order is not yet delivered. the delivery boy was saying that we have lost your product bymistake, we will refund the money only in one case when we will get the mail from our senior executives. the status of the order is showing delivered without asking the OTP. it was been delivered through the logistic company DELHIVERY. please help me to resolve it quickly.