Unilateral Account Closure

I have been retired for a number of years now and money is rather tight so I have not been shopping as much as I used to. I went to Edgars Fourways Mall today to buy a gift for my daughter who lives in London. I chose a Le Mer product and handed my Edgars card which I had not used for at least a year. The shop assistant took it away and came back to abruptly tell me that my account had been closed. If this is the way they treat elderly customers who had previously been regular customers then I am very pleased that I no longer have an Edgars card as I will certainly not put my foot in their shop again