If you have placed any order online and you get a call from courier partner asking for OTP. Please do not tell them any OTP. Tell the courier boy to come to my address first then only I will tell you the OTP. These days such frauds are very common and people take away money from your account by telling that they are calling from courier service. Sometimes they also cancel the order by asking OTP on calls.
So be safe and never tell any OTP to anyone on calls. For detailed information, Watch this Video.