Infuriated customer

I opened a Foschini account about two months ago. Today when I went to make a purchase using my card the cashier tells me that the card has expired AFTER TWO FRICKEN MONTHS!! How is that even possible??? The cashier says because my work contract has finished. WHERE HAS IT FINISHED?? I mean im not employed by TGIF. So CLEARLY whoever captured my information did it wrong now I have to suffer for someones incompetence. I am very angry at this whole situation and I new it fixed. I've been paying my account now all of a sudden my card has expired. I hope I don't have to be up and down stores for this matter to be fixed I WORK 8-5 I don't have the time!! I hope that tho problem is fixed.