Invitation to write special exam although I passed

Stadio is such a frustrating institution to study with. I received my academic record stating that I have passed ETP. I then received an email from my lecture inviting me to write the special exam. I sent her my academic record and she said she doesn't know why my name is on the list from the exam department. I logged tickets, called and they got back to me. But all they said is that they don't know why did I receive the invitation to write although they passed. They didn't solve my problem and it is confusing because it's been weeks now. Please assist me.