Shiprocket — Product not delivered even though it's out for delivery

My package was not delivered even though it's out for delivery. Every day morning, I get the message in my phone that my package is out for delivery. On afternoon, suddenly, I'll receive the OTP in my phone. After few minutes, I'll receive another message that my package is undelivered. The delivery boy doesn't made any attempt to deliver my package and he doesn't pick my phone call also. Have written an email to customer care. But no response from them too. Poor customer service.