Wrong Account

I have complaint about two months ago regarding my dual card and the inconvenience it has caused. I have asked then for this account to be closed. After emails back and forth - I received an email and a sms to say I can go pick my card at any Markham store. On Saturday I went to the Markham at Menlyn to pick up my card - call center was phoned and security questions asked. I have asked the store assistant is my card now linked and working he said yes. So I went to Foshcini for make up - after purchasing it and getting home I saw the card was linked to some one else's account - I phoned the call center on Sunday to report this now, which they instructed me to go to the store again to link my card to the correct account. But now here is my problem - why do I have to be inconvenience again for someone's incompetence ? And if some one else's card is linked our account I will not be held responsible. Please get someone to contact me in order to sort out the make up I bought and please link the card to the correct account or otherwise this damn account will be closed.