British Airways Failing and Disrespecting Passengers

I arrived in Johannesburg from Heathrow on the 30th June 2019. My suitcase was said to be delayed and I was assured that it will arrive on 1st July 2019 with flight BA0055. My bag receipt number is BA945357.

My suitcase didn't arrive. After months of trying to get help from BA offices, Menzi and sending emails with no response, I now opted to claim. I submitted all the information of the items that were in the suitcase. Still I have not received any response from British Airways.

I need assistance on how to get British Airways to understand that it is important to respond to their clients, and for them to admit their negligence of my suitcase, all the items in my suitcase and the trauma that they have put me through and to pay for all that.