Close the account

I went to the store on the 29th of July to settle the account and the cashier advised me of a fee i was supposed to pay, i did that, but i kept of getting sms's and emails saying my account is in arrears, i called the client support today 04th of July she just said to the store was supposed to call them for the final amount how is that my problem, on my site I did what I was told by that lady, the lady from the client support team said my account is still open because there is an outstanding amount of R235.60, I am not liable for that as my part was done. I feel like there are some hidden fees they do not want to disclose because they want to continue taking your hard-earned money.