Impossible to get my money from my pension fund

I terminated my employment with FNB on 2 August 2019 and have been trying to get my money transferred from my pension fund. I have sent emails to Momentum - no response. I have phoned - I get "the number you have dialled is not available - please try again later". On 4 March I eventually got hold of Yvonne and she was going to get back to me - still no response 2 weeks later. It's my money and I'm entitled to it yet it seems impossible to get it from Momentum!