If you have applied for a place in Student Campus, you have to remember that your application is valid for 60 days from the date of submission. The application must be extended at least every 60 days in order for it to not expire and be removed from the waiting list.
You can extend your application by logging in to your e-Campus account. From the left-hand side menu click the link Applications and from there click on the Application ID number.
Now you should be able to see all the data you provided while filling in the application. Under this section, you can also see a link Extend application. By clicking on it, you can extend your application for the next 60 days.
Please be noted that once your application has expired, you cannot extend it anymore. The only way to get back on the waiting list is to submit a new application.