Hello, i have had a similar issue but i sent off my Ni no. And several weeks later. I had another letter saying it couldn't be verified and to send my ni no off but surely you don't need it again do you? My payments say blocked on all of them. Should i send it off again or should i wait a bit longer. I sent my Ni no. Around the end of March so surely they would have had time to look at it. I got my second letter mid AprilMany thanks