The easiest way to sort studylink stuff out is to get a mystudylink account like they suggest which allows you to view your application details to see what's going on with your student loan and stuff in real time. Those letters they send you often take a long time to get to you, so by the time they do arrive it's outdated. Basically you use mystudylink to see what you still need to hand in, then you go to the nearest studylink outreach office and it hand it in to them physically (more reliable than sending it in that envelope they provide).