Pension fund payout

Am frustrated of calling old Mutual super fund and sending emails trying to find out whats going on about payment of my pension fund always told my account is invalid or system needs to verify the account these people seem not sure about what they doing. Everyone in the company i got retrenched from have got their payouts. I always call super fund to find out if i can change the banking details so that i can receive the payout they tell me their system has a problem accepting my details why is their system having problems with accepting my details.Phone them today again to ask any progress with the system am told to call again in 7days and find out.