Paying interest on nothing

I received a call from one of your consultants advising me that I am owing R110 on my in store card.

Looking at my transaction history on *120*985# the following transactions were made:

- 22/07/2017 a spend of R106.83 - 12/08/2017 R5.38 Interest (on what as I should have 30 days to settle my account) - 12/08/2017 R1.12 Interest (again for what?) - 12/08/2017 R30.00 account fee - 19/08/2017 R-185 Payment (within 30days of the above mentioned spend) - 19/08/2017 R21.90 Interest (on what?) - 11/09/2017 R5.69 Interest (on what?) - 11/09/2017 R30 Account fee - 11/10/2017 R5.40 Interest (for what?) - 11/10/2017 R30 Account fee

Calculating the above I should only be owing R51.32 on my account which is basically just the interest you have charged on nothing owing from my side

And as I have used this card once and am already experiencing problems like this, paying a monthly fee for a card I hardly use to spend on and get charged monthly interest fees, ridiculous.

I have emailed them 3 times and still no response but I am getting calls from their call centre asking me to pay the outstanding amount before they take further action.