Useless call centre

I recently app**** for an access bond on my home loan facility and needed an account to access this facility. Trying now to log onto the app or internet banking is impossible due to no one answering the call centre phones. I need to de-link an old card to be able to change my password but there is no answer at the call centre. The poor consultant at the branch felt so bad after I sat there for 30mins and he couldn't get through. I came home and tried again and the call dropped after 22mins. I would appreciate it if anyone could contact me in this regard. I just need an old card de-linked.