I closed my account

I had a woolworths account for a few years. I closed it 2009 in Auckland Park at Campus Square. I have been receiving sms for the last few years to say I have a balance of R2.42 that I need to pay. I have been to different shops to pay the R2.42 and then close the account. The last time was last year in 2014 at the Clearwater Mall. Two months ago I received yet another sms, only this time I owe R2.47. I have closed this same account 4 times. What is it going to take to have it closed. I'm completely annoyed by this. Everyone that assists me at the store they promise me it's closed. Only to my shock to continue receiving their stupid sms'