Reagenteça a consulta por três semanas. Isso deve resolver o problema. No seu caso você ainda não pagou. Se você já pagou, poderá solicitar um reembolso.
Por Perguntas frequentes sobre o VFS Global
What should I do if I cannot attend the visa application centre on the appointed date?
If you cannot attend the visa application centre on the appointed date, you would need to cancel your appointment and apply for a full refund. Please refer to terms and conditions and refund policy. Refunds are at the sole discretion of VFS Global and will be in line with the refund policy.