Not Closing my Account

in 2013 I closed my student account at absa and moved to FNB. Late last year I received a message from absa's courier partner that they will be delivering a credit card from absa. I called absa asking why I'm getting a credit card since I don't have an account with them. Turns out that they never properly closed my student account. I then asked them to close it and they promised it is done. But now I am receiving emails regarding my absa credit card statement. Either Absa is *********** or they are doing this on purpose. If they do not stop this I will be forced to lay a complaint at the Ombudsman for Banking Service.