Talk to a person.
WhatsApp is fastest and a human replies, usually the same day. Email works too. If an exam is missing or a date is wrong, use the request form and we fix it that week.
WhatsApp or email
For anything: a question before you sign up, a billing issue, a refund, a bug.
Refund requests: write within seven days of paying, from the number or email on the account. See the refund policy.