Blood donation itself was good and staff were frie...

Blood donation itself was good and staff were friendly, however dealing with their administrative team has been a nightmare. I have been trying to get them to resend some certified mail that was delivered to the wrong address (postal service mistake) and I've been contacting them every week for the last month and they promise to resend it and it never arrives. They say they'll have someone call me back and they never do. I'm beyond frustrated. If I can't donate blood I need to know why!!