Nedbank personal emails

Recently, I have been receiving emails from Nedbank regarding my account balance, yet I closed my bank account back in July 2016. I had called Customer Service Department to report this and call agent advised me to proceed to my nearest branch and have my details removed from the system. So I went to Nedbank Woodlands Boulevard this morning and it took customer service clerk plus minus one hour to make no headway. He firstly told me to come back another day as call centre he was calling was not answering. I refused and told him I wanted matter sorted out immediately as I was at the bank. So he finally got hold of a call agent who transferred him to another and another department! At the end of it, bank clerk told me that my details are off l the system, yet I could see my home phone number and mobile numbers on database and account detail reflects "open". When I asked clerk about it, he told me they have my details on file "in case I want to open my account again" (in his words). He then also mentioned that sometimes wrong emails and SMS are sent to wrong people.

Clerk refused to delete my information and I am stuck receiving unwanted emails from Nedbank. He told me to ignore and or block emails. Really?

I am not happy and demand that Nedbank delete all my personal information off their database as my account is closed!