worst service ever

Want to Ackermans today to buy school wear for my kid and the service I got there was the worst they made me feel so little. I have a credit card with them which I pay every month,so the cashier (Seja) says the card is not mine and I first thought he was joking coz I laughed about it,I always go to lenasia signet Ackermans to do shopping and today they say I'm not the owner of my own card,he then call the store manager (Sipho) who was extremely rude and told me he will call the cops on me coz I'm doing *****,that made me to sign twice and after that he was like "myeke" (let her go),he didn't even bother to apologize after all the embarrassment they caused infront of everyone. They so ruined my day and yet I thought Ackermans was the best but after today I'm not so sure. They don't ever verify credit cards which Indian people use but coz I'm black and mybe thought I can't even afford their card that had to treat me so bad and don't even apologize after they see that they were actually wrong.