Momentum withholding my pension funds

I resigned from my place of employment in May and asked that my pension fund be send to a new pension fund. Momentum won't release the funds because there aernt banking details for new pension fund. But Alexander Forbes has sent a form for Momentum to fill in before they can provide banking details. Momentum won't fill in that ROT form to send to Alexander Forbes. Now I'm stuck as a customer.... what's meant to happen when these two financial institutions wont cooperate with each other. I just want my funds to be released by Momentum to Alexander Forbes. I call every day waisting my airtime to follow up what kind of customer service is this....