Please contact the Charms teacher of your site and tell him about the first error. And maybe your headmistress or minister for magic for the second error. They will take care of this (:

All of the notice board posts put that this would be an option in the future but not available right now :)

You haven't really given an idea to how you would want this to be achieved, right now, as the comments have stated you need to owl your MoM, HM or management team about any problems.