HOW DO I SUE SECURITY COMPANY

I was standing on Firgrove train station on Thursday 16 April 2015 awaiting my train when I was assaulted by two men and had my mobile phone ******. I did wrestle with the two assailants and screamed. The ******s got away. When the two Chuma security personnel appeared, they gave chase but the ******s got away. When they returned, I asked if they heard my screams the one security guard rep****, \Yes