Dissapointed and fooled!

I app**** for a store credit card, and was approved. I went into the store on Friday, and was royally embarrassed when the card decline, after I was assured it was linked and registered. So after 3 store visits, almost 6 hours in total and conversations with almost 15 call centre ladies, no one can give me a reason as to why my card decline at the tills or why I have credit, but is unable to get any straight answers or resolutions to my query. I have been put on hold so many times, my bill is almost R300. I am totally disappointed in this store, for so may reasons. No wonder people prefer Checkers.