Shocking and useless customer service from British airways

I left Cape Town via heathrow airport to Miami with British airways on the 2 January 2018. I checked in 2 large pieces of luggage and when I got to Miami I had no luggage. The BA gentlemen promised my bags would come on the then next flight which was landing that evening at 21:00. I gave my hotel details to him and advised him that I will need my bags as the next day I would be travelling to Fort Lauderdale. My bags did not arrive at the hotel and no one could tell me where my bags were. I had to leave with only the clothes I had on me after travelling for 2 days. I completed the online missing details and called numerous time first to the Miami delayed luggage which was pointless then I started calling the London delayed luggage. They told me at one point they found both bags and it will be sent to Auckland New Zealand on 2 February 2018. Still no belongings or clean clothes for a month. 2 February came and only one bag made it other one apparently lost. All they kept telling me was that they are sorry and the bag is still lost with all my electronics . After 21 days you can put in a claim. At my different stops I had to buy bare essentials because I had nothing with me. One minute I was being told yes they found the bag then the next time I call I was told no the bag was still lost. Asked to speak to a supervisor and I was told sorry they not available. Multiple international calls for useless information. But not once did they call me or send me updated emails as there online window was useless as it stated both my bags were found. I put in a claim and I’m still waiting for my claim to be processed. It is the 17 April 2018 and still nothing from British airways.