Cheque account handed over without any notice

In 2009 I visited Standard Bank the one at Church Square. As it was the first time in my life opening a Bank account I was then directed to one of the consultants who then opened a Bank account for me , & I not knowing then the difference between a Cheque & Savings account I just signed & took my card. I only used it for three/ four Months if i'm not mistaken & unfortunately a few Months later I then lost my job which is when I stopped using the card. Three/four years later without having received any notice letter from STD Bank regarding this , I found out that I was listed on ITC, & my account is also handed over to two Companies MBD & DMC who are constantly calling & sending smss every single day. I've advised them to send the acc back to STD Bank & notify them to stop violating my Consumer rights & follow the correct procedure. The acc is owing R7000 of which I don't know how because once an acc becomes inactive banks usually closes it & this one was closed back in 2011 but it has an outstanding balance of R7000 & seating with two Debt collecting companies. I need answers from standard Bank as to why wasn't I notified ...& how am I owing R7000 ?