Sandra owes Tanya K2000. Sandra knows that Tanya is experiencing some personal difficulties as well as being in financial difficulties and needs the money urgently. Accordingly, when Sandra is approached by Tanya she delays payment, but Sandra finally offers Tanya a cheque for K1500 in full satisfaction of the debt that she owes Tanya. Tanya accepts the cheque from Sandra for K1500 immediately. Advise Tanya as to her legal right to recover the balance of K500 from Sandra.