Silence is golden

This company doesn't respond to customers. I have been emailing them regarding my pension and to date haven't had a response. What can be difficult to provide me with what I am requesting which I am entitled to. I have emailed their fund queries department without a response I then emailed Dudu Buthelezi who was prompt to respond she referred my request to Jeffery Deelman and Elphia who haven't responded. So what must I do now to receive a response. Clearly I am not priority.