its a scam, its been happening for years. they see if you answer or not, and when you do they hang up immediatley cause they have nothing to say. they sell your phone number illegally to telemarketers since they know you will answer the phone. there is no such thing as the United States Prescription Card Department, its fake try and find anything about it on the internet. put your number on the national do not call list, and report the 281 number.