The appellants, trustees of the Wilke Boerdery Trust, applied for cancellation of a surety bond registered in 2003 in favour of the respondent, Griekwaland Wes Korporatief Ltd (GWK), over two farms. The surety bond secured indebtedness arising from goods sold, production credit and loans advanced to Wilke and Henque 4335 CC, later consolidated into Karob Boerdery (Pty) Ltd. An acknowledgement of debt (AOD) executed in 2006 recorded arrears only and expressly reserved GWK’s rights under the original credit agreements. GWK later sued Karob and Wilke in 2009 based solely on the AOD, but that action failed because the arrears were not proven. Relying on that outcome, the Trust sought cancellation of the surety bond, arguing that GWK was precluded by res judicata or issue estoppel from relying on the original credit agreements to retain its security.