Suddenly since 21/12/15 getting Spammed all day.

I am getting spammed all day and night, I have won all the OMO competitions, won hundreds of thousands of Rands, 54 new Toyotas, and can apply for finance for Millions of Rands at only 3% interest. <br> WHY?<br> WHY?<br> I have been a Cell C customer since it's inception and have NEVER had this amount and frequency!! It's as if all of a sudden my number has been released to the wide world. I block the numbers as spam but the messages keep flooding in...wait...OH yay ....I've just won another Toyota!!!<br> Please Cell C HELP me put an end to this tirade or else I,m afraid you're going to lose my business account......<br> There must be a way to stop this???