Humiliated customer

My mom bought stationary from another Pick pay branch and when she realised that the books were not the ones required by the school , she went to Pick n pay Moletsane to exchange the books . She was told she can't return the books in that store and she will have to take them back where he bought them by a manager there Lulama Mtingane who is not available to take calls as I've tried to call the store and get clarity on the above matter.