Bad customer service

I invested money with sanlam in 2017 and I recently contacted them to do a withdrawal from the funds I invested unfortunately I was adviced that I cannot withdraw funds until the maturity date however the problem is that I need the money urgently to cover an urgent matter. I find the service appauling as I should have access to my money especially since I did advise the agent that the matter is urgent. I now wish to cancel the investment and withdraw all my money because it does not make sense to me that I have to fight for what is mine and the fact that am being denied service is just annoying