Card not linked as required

I got a call from the call centre in Durban where i was asked if i can apply for a cheque card as i am getting billed a lot on bank charges on my debit card. I agreed and received the cheque card and went to a branch Sandton City Mall to activate the card only to find out that my old card is not linked to the new one. Please help as i want my old card to be changed to a cheque card as i requested. I also would like to know why the card was linked in the first place as that was what i asked for when i first app**** for the cheque card