Standard bank - can't admit they're wrong, horrible service

Initially complained that a large sum of money was added to my loan due to non-payment which was due to a debit order issue as a result of consultant incompetence. Customer services started to look into it and then never got back to me as agreed. Figured they realized I was right and just don't want to give my money back. Pathetic service. Any advice on how to take the matter further would be appreciated.