Prejudice and incompetency

There is an *********** lady employed by Securitas specialize who has been withholding my provident fund claim condiments since September last year. Regrettably, she is unresponsive to calls and emails, and I have been unable to get in touch with her despite numerous attempts. With only her contact information available and the physical distance between us (I am in Cape Town, and she is in Johannesburg), I am unsure of how to proceed. Can anyone advise me on the best course of action?