The Teacher Discount Card; Saving you Money, Enjoying life! Appreciating teachers with discounts and promotions! Big savings everyday with the Teacher Discount Card! Helping businesses grow, saving teachers money! C.L.A.S.S. Consulting is the parent company of the Teacher Discount Card (TDC). As an educational professional services company since 1998 we have extensive involvement and experience in advancing and promoting quality education in South Africa. The Teacher Discount Card (TDC) brings a unique perspective for business to generate new customers, from a potential client base of 500 000 registered teachers. It does so by offering teachers discounts, special offers and promotions at participating discount partners.