******ion of Fees

I would like to raise a complaint on Dion Wired's card billing information and visibility of charges. I paid my outstanding balance(3915.93) a little bit extra(3920.00) in July 2015. I received my statement yesterday stating I owe R14,87, I was charged interest on the 10th of August 2015 of an amount of R16.87. I phoned through to the call centre and asked why I was charged interest, their response was that because I did not settle my account by phoning the call centre, I was charged a service fee, interest and customer protection insurance. The service fee is not listed on my statement and according to the terms and conditions on the RCS website it should show on my account? Also nowhere on my statement or on your website do you state that I need to phone the call centre to settle my account to make sure I get charged extra fees. Also on what amount was the interest charged, according to my statement Interest should've been charged against the outstanding amount of R-4.07, please can you clarify on what amount the interest was charged?