THE ORGANISATION has multiple sponsorship and endorsement deals [which span for the duration of the next 15 years] with a SPORTSPERSON. The SPORTSPERSON tests positive for a performance enhancing substance. Additionally, the SPORTSPERSON is accused of multiple (unproven) personal scandals, further making them the focus of unwanted publicity and attention. In light of this, the ORGANISATION withdraws their sponsorships and endorsements from the SPORTSPERSON. Does the SPORTSPERSON have a potential enrichment claim against the ORGANISATION?

Answer should be based on South African law and should include very thorough in-text referencing.