Waiting 5 days already for a R9500 refund!

I purchased 4 heaters on Friday that was on special on the website just before closing. They then said after i paid that the special is only online. I asked if they can refund me then i will order online, which they then did to the Builders card. The lady assisted me to buy the heaters online, but we were not able to use the credit on the Builders card and i had to pay again. The lady send me to Caroline who then had to assist me with the R9500 refund on my card where i then was advised that the till dont have enough money to refund me, she will call me and refund me on Saturday. I explained i an not going to come in again, she said it is ok. So no one called Saturday. On Sunday i called in.After alot of struggle with Caroline i asked to speak to a manager she kept me on hold for 20 minutes and the call dropped. I Called again and asked for the manager and was transferred to Joseph. Joseph then quickly assisted and transferred the matter to Tilly account manager. So yesterday i called again as she did not return my call. She said she is on the sales floor and she will call me in 30 minutes. Now it Tuesday already as she havent returned my call. I can not understand that if you owe someone money that i need to call 500 times and that no one is capable of returning a call or doing the refund. This is terrible service and i will definitely never be shopping at Builders again!