AMERICAN AIRLINES! AMERICAN HORROR STORY!

Even 1 star is too much! American airlines, I cannot get your attention and acknowledgment about the atrocious treatment I received today on one of your flights. I have never been treated so badly on a flight like today. My back pack strap got stuck in another passenger's seat on boarding and I called a flight attendant, sila, to help me and she was so rude and irritated and not willing to help that she yanked my bag and broke the strap. She then denied it and refused to take responsibility. She walked off saying she cant deal with this! Her colleague, lucas, came to me twice and told me to sit down and stop complaining and that I should just let it go! Being a solo traveler and first time to USA and on american airlines, this is not living the american dream and I cant believe american airlines have hired such unprofessional and careless people! I was victimised and told off in front of everyone on the flight and yet it was their fault! They also didn't want to give me their names. I asked for the captain and they said he left long ago. I reported this to 3 supervisors at the airport and wasted 3 hours of my expensive holiday trying to log this complaint and get a solution and it really inconvenienced me as I had 3 pieces of luggage to carry, one which is now not usable and only 2 hands. None of the supervisors could really help or give solutions and the only way is via the website but I needed immediate action. With all the systems and technology in place you would think this could be sorted out immediately and easily. Is this what american airlines standards for??? Who is going to take responsibility for my broken bag and that I have to continue my holiday without my backpack?