Poor service by Blake and associates

How difficult is it to send a confirmation letter on the payment arrangement agreed on? Since yesterday I have been waiting for blake and associates to send me an email confirming our payment arrangement in writing. The call centre can only confirm that they have sent a request for the confirmation to be emailed to me but cannot tell me when will I get it. Despite explaining even to their team leader Lynette that I need that confirmation as soon as yesterday for a prospect employer who needs it to complete the recruitment process checks and give me a work contract. I am at the verge of loosing out on employment because it takes a company years to type out a minute email and send confirmation of payment arrangement. If I loose out on this opportunity because of them , how will I be able to pay off my debt that they are collecting monthly. I am extremely disappointed them.