SHIPMENT PUSHED BACK A MONTH PLUS THEY OWE ME MONEY

I am so incredibly DONE with AT&T! First things first they owe me money from a promotion I did back in December where you trade in a iPhone and receive a iPhone 11 for FREE I sent them TWO perfectly working iPhones and I should have received TWO free iPhone 11s instead they only gave me a promotion on one.... so that being said I have paid now FOUR installments on a phone that was suppose to be free! I have Contacted AT&T customer service at LEAST 10 times about this where one after the other they have given me the run around about it and a couple of times ADMITING ( imagine that) they don’t know why it wasn’t added... I eventually got through to a area manager who admitted that the girl who did my promotion messed up and this was their mistake she also promised to have this taken care of in 3 - 4 days but I never received a call back from her and my account remains the same! They now owe me 80 dollars in installments that I have paid on a FREE phone which I have yet to see a penny of! Moving on to the iPad that i ordered in store that they Guaranteed would get to me in 3-4 business days that now has been delayed a MONTH what kind of buisness are these people running?! I love how they can manage to get your devices to you in 2 days as long as you sign a two year agreement and give them a wad of cash! I will be taking this situation public if they don’t fix something soon I’m done getting the run around.