Keep on getting SMS - Don't even have an account

I started getting SMS from Woolworths last year stating my account is in arrears and what my instalment is. I phoned them and explained to them that I don't even have an account and NEVER had one before. As soon as I phone they ask me my ID, that won't help them as I don't have an account. Then I give them my cellnumber. They make a note on the system to remove my number from the account (MRS. Dlau). Then at the end of the next month I get an SMS again. I phone again and again and again and still today I received a SMS from Woolworths. <br> <br> I DONT HAVE AN ACCOUNT - PLEASE REMOVE MY NUMBER FROM YOUR SYSTEM