Impossible to have an adviser on the phone, imposs...

Impossible to have an adviser on the phone, impossible to make an appointment by internet, no email address to send a message and they naturally do not receive without an appointment. How to do ???
Very dissatisfied (and I remain polite). The only time I was able to speak with an advisor was when I went to the Marseille fair where the person was very pleasant and competent. Here I am stuck in the production of my file for the rectorate.