interest bearing/ higly dissapointed

on the 13/02/2016 i went to Identity in blue route mall to pay my balance of my account. When paying i asked the cashier do i need to call the head office to close my account see that i paid the balance, and was advised that no the balance is paid up so the current balance is R0 no interest will be added on the account. yesterday while speaking to a friend about it she advised me no i need to close the account as Identity will charge interest even if the balance is paid up not knowing this i called the head office and the lady advised me that my current balance is R125.03. How ta hell is this possible i was mislead by the consultant in the shop not knowing that its a interest bearing account but this is ridiculous R125.03 interest over 3 days what is this 100% interest i would understand if it was over a month but 3 days is messed up. so now i need to pay this when i never even used the account after paying my balance. this broad day light *******. I'm disgusted by this you think you become debt free but the debt just continues by the ridiculous interest rates.