Eskom Customer Service is impossible

Have been trying for 10 days to get through to Eskom accounts. I have sent an email and texted as per their advice. How do I speak to someone? Please? It has taken 18 months to arrange a refund on the account for my previous property I have sent everything they asked and finally proof of my bank account. Now I have received my account by email with the refund marked as “unclaimed monies”. I really don’t know what else I can do.....