Bad customer service and *********** clients

On the 6th of November 2019 I had gone to Foshini Fourways to go pay off my account. I had asked a teller named Refilwe how much I need to pay to close it. She told me around R1500. Which I paid, then asked her to close it. She then called their call centre to get my account closed. Then they told her that I over played and refunded me about R844.11. They also told her my account will be closed by the 15th of November 2019. When I called to find out if my account was closed they said no. They then proceeded to tell me they would send me a paid up letter within 4 weeks, which they didn't. Then daily call keep on calling me to pay it off. When I tell them my story they said they would put through a query. I kept on going to Foschini Fourways to get help, but they keep on blaming each other. Now they are telling me to pay it off, after me wasting money trying to enquire what is happening and that I'm not liable for this. Due to the fact that they told me my account will be closed by the 15th of November 2019. It's still not closed. I am frustrated.