Terrible customer service

visited OK furniture store yesterday at Sam Ntuli Mall to pay my account, the last balance after my payment in January and current balance were not adding up even after I payed double my amount due to avoid interest charges and I had questions regarding the interest charges on the account. The operator that was helping me did not bother answering any of the questions I had, she literally rolled her eyes at me and continued chatting to her colleagues. I payed my account and left but because I was still unsettled about the balance amount and really needed answers I returned to the store after a couple of minutes, as soon as she saw me return she made remarks, loudly said “Ahh yoh” as if I was a nuisance or an idiot. I ignored that and asked if I could just settle the balance amount and close the account, she told me the amount on the system and the one on my slip are not the same and when I asked how, she said it’s interest charges so I asked how because I just payed, instead of explaining how the account works or referred me to someone who could give me answers because she clearly doesn’t know what she’s doing she did the same thing again, rolled her eyes at me while chewing gum and ignored me as if I wasn’t standing in front of her waiting for an answer. I ended up not settling the account or receiving any answers to the questions I had. I felt so disrespected and undermined by this consultant.