Closed Paid up Bank, but receiving threatening emails and texts that I owe money??????

It seems there is NO getting away from Discovery Bank. Lets follow the process I followed to get a way from Discovery Bank. 1. I called to ask for process to close my bank account; 2. I received a settlement letter, which i paid; 3. Called repeatedly to get acknowledgement that settlement has been received and we can move to paid up and close status; 3. Waited the 8 working days period; 4. Received written confirmation of paid up status and close of accounts (3 Oct) Now i am being inundated with emails and text messages claiming I owe Discovery (17Oct) R1,209.27 - heaven forbid trying to call and get someone to assist, the call center tells you that they will transfer you and then cut the call. I am hesitant to click on any email links for fear of phishing. How, can I owe anything when i used their settlement value to pay up the balance, and requested closure. There has been no transactions on my part, and since 3 Oct this account should be closed. Call me Discovery, the service I have received is reprehensible - and I would like to cut all ties with immediate effect. WHY AM I RECEIVING THREATENING EMAILS AND TEXTS?