Shell Petroleum Development Company — Shell international Mobile Draw UK

Sir,
I hav recieved a massage that my mobile no had won a prize money abt 400, 000 pounds. They asked me for my address, name & phone no. I also sent all the documents through mail address. then they asked me to contact with their delivery agent Heathrow Freight Courier Express. Should i take next stepi.e. depositing delivery charge. the delivery agent also told me to send delivery charge first & after 72 hours i will get the prize money. Plz. help me through my email. address -miss.s.[protected]@gmail.com
thank u.