Bad service at Maiseys Plastics - Roodepoort Branch

Yesterday I bought printable heat transfer vinyl for inkjet printer from the Roodepoort branch. I explain to the 'sales lady' what I want to use it for and even show her a image I want to print. I bought a 10meter roll. After I get back home and try to print tie ink wiped off. I phone the branch and they told me that it is the wrong vinyl. The vinyl given to me was for eco solvent printers. The sales lady told me that I told her that I can print on it and make out as a liar. My wife was with me when I bought the vinyl and take it back and also heard that I ask for printable inkjet vinyl. I try to print on a half meter. They gave me half meter back and said they will refund the 9 meter today. This morning I send a email to the 'sales lady' to ask when they will refund. She replied back that she told me that is take 3 to 4 days. Make me out as a liar again. Why do I have to wait for 3 to 4 days for my money to be paid back and just for 9 meter after the sales lady was at fault.