Mr D Courier Credit Card Delivery

I app**** for a credit card which was approved. Received an SMS on 16/08/2017 notifying me that Mr D Courier will be delivering the card. Mr D Courier called on the 18/08/2017 to confirm the address and date of delivery for 21/08/2017. No card was delivered and I did not get any communication from Mr D Courier. Two days later still no communication from Mr Delivery regarding the delivery. I tried to follow up with the call centre numerous times on ********** using the reference number of ********** 5 but the consultants are always busy regardless of the time of day. How will I get my card? Please follow up as Mr D Courier clearly has no intention of communicating with me or delivering the credit card as time soon. Their service is extremely poor.