Account closure

Since the last review I wrote, Standard bank wrote an email giving me a reference number and said they would contact me but I haven't received any call from them all I've received was voicemails of an automated message and that's the only thing, not any missed call messages or pop ups. I then made contact via email asking for a contact number that I can reach them on as a response to an email they sent me that they have been trying to get a hold of me but to no avail and they did not respond. Now they are sending me another email saying that they will be closing my case due to my unavailability but yet they have not given me any contact details so I can make contact with them.

I am failing to understand how are they closing my case whereas I am making means to get back to them to find out what's needed from me.