Staff attitude on refunds

I have received a terrible service from staff over a R90 refund at pep store deneboom station 8258. i was given a bad attitude for a refund I waited close to 30 minutes waiting for the supervisor who authorised without greeting me. instead she and the cashier discussed me infront of them like I’m not present, deciding wether they should give me cash or refund back to my bank card. While I was waiting for the supervisor to come an authorise my transaction was put on hold n people behind me were called to come n pay. Pls educate your staff about customers rights to refund n exchange it’s not their money but pepkors money. They must learn customer service from Tshwane regional mall pep store staff