Woolworths Unexplained Account charges

Queries on Woolworth Account charges not given..I have a Woolworth Account and used it to purchase a phone on 4 months interest free financing.. Woolworths has added fees of about R400 that is not explained & no statement is given to me monthly. I walked into East Rand mall to query this & was given their telephonic consultant who made it impossible to get my query Tru as she wanted an address that I was not sure what address I used to open the account as someone who has changed jobs several places. identity was verified by in-store buy still the telephonic lady refused due to address. All I want is an explanation how the account had the extra R400 added on my account? Please help me there as Woolworth doesn't send us statements