Manger with bad customer service

Hello Peter. Shoprite liquor mini mabopane the male Manger there made two of employees feel uncomfortable and illiterate after buying a wrong item of 6 pack. They bought Mayfair instead of Belgravia gin and tonic. Suddenly I'm called and rudly asked did I send people to the store who can't read, well he went on to say that they will not be able to fill in the return book without asking them first. Please take him for customer care service classes please!!