Tusk Construction Support Services (Pty) Ltd and Joint Equity Investments in Housing (Pty) Ltd instituted action against the Independent Development Trust (IDT) for payment of approximately R2.5 million. The summons cited the trust itself as defendant, not its trustees in their representative capacity. After pleadings had closed and shortly before trial, IDT objected that it lacked juristic personality and that the summons was therefore a nullity. The appellants sought leave to amend the summons under Rule 28 to substitute the trustees of IDT in their representative capacity. The High Court dismissed the application for amendment (and a conditional consolidation application), holding that the action was a nullity incapable of amendment. The appellants appealed to the Supreme Court of Appeal.