E:? Navman Sat NAv

Yesterday I picked up a leaflet from a Shell petrol station offering a chance to win one of a 1000 Sat Navs, All that was needed was to text 82100 with the message SHELL 347843. I had atext back in seconds saying that I had won one and would be contacted within the next week for address details. This morning I had aphone call from Shell asking just that, obviously I queried it but it all seems straight to me and was told to expect it in the next five days, all it cost was a normal text cost. Anyone else know of this offer which ends on the 25th FEb.
I did try again later to be told that I was unsuccesful, you have to goes in aweek, its worked on a time type offer not on the voucher, IE it depends if you hit the right time to text. :j :j