A person, from this number, has been sending me text messages claiming I have won some type of prize through some type of Facebook promotion deal. They claim I have won some prize worth close to $600,000 and when I send $450 - $500,  they claim, I will receive my winnings by FedEx Courier. After checking it out on line, I know there is no such contest. I have emphatically tried to get them to leave me alone, but they are persistent. Could you please check this out.