Won't change banking details

As long as they can install a tracker device in your car and deduct the installment thei're happy i need to change the bank account details from which the installment is debited from there won't be funds available in my wife's account. But tracker refused yes you can speak to my wife she can only be reached in her lunch during the day as she is not allowed to answer the phone at work. To make this easier you can speak to me i'm her husband. Then contact her between 12 and 1 or 1 and 2 or 11 and 12