Can not withdraw from old mutual app and been transferred back and forth

I have a savings investment with Old mutual, I have been trying to withdraw money from it using their app, the withdraw button is disabled on the app. I have been on a call with old mutual call centre for almost an hour being transferred to different departments where i am told my money is with Group scheme and will be transferred to that department and still get transferred to an incorrect dept. Last person i spoke to not sure if she said her name is Nabina but hang up on me when i waited to be transferred again Old mutual I want my money as in today.