Worst Customer service in twenty years

I had a flight from Seattle ,USA, to London Heathrow, to Johannesburg, South Africa. My checked luggage did not arrive with me when I landed. It took twenty nine attempts to call and communicate with inept staff. Different staff members gave me different stories about where my bag was and what happened to it. One would say it is in Durban. The next would tell me its in Johannesburg, the other would tell me its with courrier service. They would give me incorrect contact number to the courrier services. They would say they would look into the case and call me back. No one did. On five occasions, the phone was out down in my ear. On day 4, I had to purchase clothing and toiletries. Day five one of them told me my bag was leaking and that is why it is in the ba*****t. Beauty told me I can email permission for them to open my bag and they can drain what is leaking and then they bag could get on a aircraft and be delivered to me in Durban. I was concerned that things may get ******. She told me if that is my concern, i should come pick it up in Johannesburg at the airport myself. I gave permission and when My bag made it to me on day 6, a brand new pair of shoes, was indeed ****** out of my bag. When I contact British airline, i get the run around about where i should fuller a complaint. I have still not been able to find the correct channels to file a complaint or be reimbursed for the damage and unnecessary expenses due to this event. Poor poor poor customer service and very customer unfriendly website!!