Poor service from studio 88

Good evening, i have I'm not happy about the service i got at your stores today and yesterday. Last week i bought sneakers at dobsonville for R750 ,i returned the sneakers at Maponya and wanted to take the one i saw R500 and i was told if i wanted sneakers for 500 i won't get change back instead i need to take something that costs R250 and I didn't want anything i then advised that i wanted a full refund i was told that i needed to go back to dobsonville. I then went back to dobsonville today and they denied me a refund i want told that it wasn't possible because the manager was not present and all that is not written on the slip as part of your policy i have to spend unnecessary cash from going from pillar to post, when purchasing goods at your stores we're not advised about all the terms and conditions i want a full refund, please advice