i have been charged for the acount that i have closed many many years ago

its been more than 10 years i had a credit card with standard bank,paid evrything when i wanted to close the acount i even paid extra ,foned card division for my acount to be closed,only late last year they started sending me letters that im owing them,went to the bank called card division again for clarification ,the guy i spoke to said im not owing anything even gave me the ref number for my call which i kept,than again recently started sending me letters that im owing ,i went to the bank foned card division again spoke to Alex Mashinini explained to him that i have paid evyrthing years ago and closed my acount,now my name has been handed over to ITC ,he apologised and said that is their mistake the acount will be closed i then requested a letter that state the close of my acount to nbe sent by email,he said by the 17th of this month the letter will be sent ,but now its end of the month ther is stil nothing from standard bank,and again i know they will start sending me letters ,im now getting my lawyer cos im sick and tired of standard bank, my name is Nozipho Gina ,my number ********** 382