Harrassing SMS

How do I stop these people's sms to my cellphone with regards to somebody owing Cell C monies. If it is not the above company then it is another. I have used my time and monies on every occasion to inform them that I do not know a MS L FAYE who owes Cell C money. I have begged and plead and screamed and shouted you name it to no avail. I have told the people I do not owe them a cent and that I am not MS L FAYE. How <br> does one deal with STUPID companies like this? Surely should they not first do tracing and the likes before<br> doing blanket sms like this. <br> <br> Just image if my girlfriend had to see one of these sms's.