PAID UP LETTER DELAY

I AM DISSAPOITED IN AFRICAN BANK COLLECTION DEPARTMENT, I PAID UP MY ACCOUT ON THE 26TH OF JUNE TILL TODAY I AM STILL WAITING FOR THEM TO SEND ME MY PAID UP LETTER. EVERY TIME I CALL TO EQUEST THEY SAY THEY WILL SEND IT RIGHT AWAY AND IT IS ALMOST 2 WEEKS AND HAVE BEEN WAITING FOR MY PAID UP LETTER