I have graduated and submitted a deregistration and reimbursement request form. Nevertheless, my account is still being debited for tuition fees. Is this correct?

It sometimes takes time before your request (via Studielink) is completely processed. Before you can actually be deregistered, the University of Groningen has to wait for your Faculty to send the results of your final examination. This may take as long as two months. If you have been waiting even longer, please contact the Student Information and Administration.