any one who recieves messages telling they won some amount of money????

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i alway recieves text messages that I won a big amount of money and they are asking me to call them to claim my prize but i din't call anyone of them because i think it is just a spam messages.. i'm planing to report this to the NTC but im thinking it's just a waste of time....did you incounter such like this..? what did you do..