Poor communication leads to me paying R3000

Good day Standard bank I have closed sent through a letter to my prestige banker Ngwenya, Nombulelo at Richardsbay branch, on the 19th June 2017, requesting to close my cheque account, little that i knew that the account was not closed, and now due to unpaid debits i must pay R3000, i am constantly receieving final demands treaths from the bank, this is not my fault, how must i pay R3000 for somebody not doing their job, I have also emailed to ********** showing them the proof, i have also sent emails to ********** on and still no response, standard bank wants to cripple their long standing clients, i have been here for 8 years and now you want to take me to the cleaners I am very unhappy Regards Desivan Kisten