Beware incorrect charges, because it is impossible to get a refund

I app**** for an Italian Visa at the Johannesburg branch and paid the appointment fee for myself and 3 family members online when booking the appointment. When I attended the appointment on 9 January 2025, I was mistakenly charged the appointment fees (4) again. When I noticed this error, I was given contact details for a manager to arrange a refund. Despite sending all the required information and being promised several times that the refund would be processed "soon", I have still not received it (now July) and my emails have stopped being responded to at all.

When I contact the call centre, they can't help me and instead give me new email addresses that also do not respond to my plea for my rightly due refund.

What do I have to do VFS?