Card Cancelation without notification

Please can someone competent give me a call to assist me with my query.

My cheque card was cancelled today without my consent nor me being notified. When I called the Premier Banking call centre, I was told that my card has been cancelled because I do not have an overdraft facility and my account will now be changed to a normal premier account as opposed to a Fusion Premier Spouse account. I cant understand why because I have always had an overdraft facility available. The consultant could not help me and asked that I order a new card and we need to investigate what happened. She seemed *********** and lacked business knowledge. Her line was terrible as I assume she is working from home, we ended up losing connection and then struggling to get hold of someone else in the call centre. As we speak my card is cancelled and I do not have a card to use and need someone to urgently fix this issue.