Nu debt management - unprofessional.and pathetic service

Ihave had a diffficult patch and finally managed to settle my account.2 weeks havr gone and i am still awaiting a paid up letter .i have called and i have emailed and still.nothing. leave alone , u can never get hold of nu debt management . The team manager tashny was quick to email and call when she wanted payment. Yet when i email for feedback for my paid up letter there is no response .unnaceptBle and terribe customer service