Poor Customer Service

On Sunday 17 January I did some shopping at Spar Fontana Blueberry Honeydew. Included in my shopping was a 2 litres of Honeydew Fresh milk which had an expiry dated 21/01/2016. On Tuesday 19/01/16 i discovered that the milk had gone sour and as a regular customer at that Spar i took the milk to be exchanged. I spoke to the manager Mr Morne who insisted on a cash slip - who keeps their cash slip when you buy milk??? . He refused to exchange the milk and said it was company policy to first phone the supplier and then check with his boss, all this for 2 litres of milk worth R20 which i am sure the supplier would have taken back. After an exchange of words I left the store and went tp PnP to buy the rest of my stuff. About an hour later Morne phoned me and said the supplier would exchange the milk and give me a hamper. I said to him it was too late for that and that he had caused me major inconvenience as a regular customer with his bad attitude and poor management skills as well as customer service over 2 litres of milk worth R20. I questioned his discretion as a manager who just lost a customer because of his poor decision making skills and attitude.