The appellants were members of the Venda Government Pension Fund. In 1992 they elected, under a privatisation scheme introduced by Proclamation 2 of 1992 (Venda), to have their accrued pension benefits paid out or transferred to private investment plans. They received lump-sum payments calculated by reference to their actuarial interest. Subsequently, under pressure and protest from the Venda Government, they repaid portions of these amounts, allegedly as overpayments. After Venda was reincorporated into South Africa in 1994, the appellants received further payments from the pension fund based on revised actuarial calculations. They instituted actions against the Government of the Republic of South Africa to recover the amounts repaid, relying on the condictio indebiti, and also challenged the constitutionality of later proclamations regulating the pension privatisation process.