Pathetic Service from Supervisor

Few weeks back i received a gift from my mother inlaw based in Johannesburg who came to visit us in Cpt& she bought few items at woolworths.i had an item i wanted2exhange2due size&quaility which i didnt like, then went to woolwoths to exchange lastnit.she left Cpt few weeks ago&to realise she put the slip in her bag.2cut the story short, yesterday@Canalwalk i was asked by the cashier for till slip&i didnt have.i hv explained the sistuation to her, she called her Supervisor Nawjwah who was very very rude, shouting&telling me she will do the exchange without till slip when she wants as it is based on managers discretion, she made me call my mother in law to confirm from her as to where she purchased the item,the exact date so that she can check on the system if there was a purchuse done during that week. she gave me hell till i requested to speak to a store manager who didnt have a problem exhanging the item. im super dissapointed at a service i received from this woman, she was rude, unfriendly, speaking in afrikaans(as if i understand),saying she is tired of customers returning stuff without till slip,that phrase ididnt understand, WOOLWORTHS must do something about such staff