Bad company

I have been calling old Mutual trying to find out about my Cashout for pension fund. All the time i talk to different people saying i filled in a wrong bank account and it doesn't match with my Intials they say i should confirm it to them then i confirm they tell me the bank account am giving them is the one they have then i ask them how possible is it that its declining coz i have been using the account since 2013 even for my salary they hang up my calls. I call again still trying to find out what is going on and what i should do they say they have been sending texts messages to say i should send them correct account which nowam lost coz the account they have is the only account i use for everything and its not the first time i i claimed from old mutual now my question to the lady i was speaking with was how come last time the payment from Old Mutual came through but now u say my account doesn't match my Intials