4 different interest charges on 1 account

I have had an Edgars account for years. Recently I decided to view my statement as my installment was not decreasing at all even though my balance has decreased by over R2000 in the last few months. I viewed my statement and found that I am being charged 4 different interest rates and 4 different monthly installments to the value of over R700 for a balance of R5000.00 while paying them every month.

Naturally, I called the call centre today. Spoke to Silindile and Yolanda who both dropped the call on me once they heard I was querying the interest charges and installment.

Again I called and came through to Yolanda who explained that your stores have a budget and straight option and apparently budget was being used often by your store staff when I made purchases without asking me. I explained to Amanda that I was not aware of these two options and was never asked by your store staff (Parow Store) on the selection instead I was only asked to sign a paper every purchase. Yolanda proceeded to remain quiet and when I asked her why she is quiet, she couldn't answer. I requested to speak to a manager and she advised to please hold. I held and surprise I came through to another agent by the name of Amanda. I spoke to Amanda who advised that her manager will be calling me back which has not happened.

I need someone to call me to resolve this issue.