Change of Nedbank account to Capitec bank

As I went to bed service on changing my bank account details for three times at Sanlam who referred me to a telephone that respond with two to three hours.It makes sanlam worker's to get tired to help me on SAPOS pension fund benefits.In this four months now I want help because they said that they got all my Bank details were changed from Nedbank to Capitec bank.I still received my money at the same account details of Nedbank.What should I do to faster this issue of changing bank to bank while it seems as careless about it