Ecom Express — Not receiving OTP for my orders

Its been more than 5 days and the company neither responding to my mails nor taking things seriously.
They are telling they have send me an otp on my number. But i haven't recieved any otp. I have explained and tried to talk with the courier boy several times but he says its policy.

Then they say the number must be wrongly updated in the Ecomm express system and ask me for my phone number to update in their system and resend the delivery next day. But no one updates that and comes next day.

I have complaint about and mailed it to them but haven't recieved any further replies from them. I tried to contact to customer care service but they haven't been helping in any ways.

There are 6-7 orders which are stuck with them.

Please help me out so that i can get my order as soon as possible. Its urgent.