Old Mutual Change of Baking Details

I have been trying to phone non stop to change my banking details on their system. I have been on the phone this morning again for 24 min started my call from 9:42 this morning and not getting trough. You hold and hold and hold till you are blue in the face. And old mutual please do not reply here by saying i can do it on the portal. As i do not have an excisting policy with you. So no that will not help, I have been trying to do this since last year. How can one simple call be so hard to do. This service is shocking that you have to hold so long and not being able to get trough. So please tell me how am i suppose to do this. Also do not come and tell me to send a mail as i have done that with no response has been received either. Service from Old mutual is socking.