Unused account

I. Ve been using stand bank as from 2009 as the student achieve, i used it until i get employed and afterwards i got a call from standard saying that i have to change the card to cheque account because the student achieve got to much charges off which i did and i used it until at the end of 2016 i. Ve lost my job. I had some debit order that were now being reversed because i had no money so i once took out the bank statement as the sign of me checking if it still active or not because my cellphone app wasn't allowing me anymore, anyway i august or September i got a letter from them saying m owing them R3300 so i asked them for the agreement that i signed showing that if i don't pay or close this account i must pay for the bank charges