Horrible customer service as a new customer coming from Sprint

I've switched to AT&T after having Sprint for 6 years. A sales person came to my home on 6/13 and informed me of the quality of AT&T and promotional deals. I placed my order at home with Mac Blank and was told I'd receive the phones by Father's Day. Then, after waiting 3 days the phones did not ship and Father's Day was approaching. I called customer service multiple times and no one could give me a solid answer and confirmed I wouldn't get my phones by Father's Day as promised. The reps over the phone advised that I could go into the store. I went into the store and I switched on 6/16/18 and was promised that there would be no activation fees and that I'd receive a Visa Reward Card for $100 per line for my 5 lines that I ported over from Sprint. I've spent 3 hours at an AT&T store on 6/16 getting my devices and numbers ported. The manager promised the same no activation fees and the promotion as on the original order. The store manager Laura advised the original order was cancelled and I paid the sales taxes again plus some. My credit card was charged for the original order, which shipped but I never got the phones. Nothing was delivered to me as the manager advised the order was cancelled. My credit card still has been charged this additional $324. I called in to customer service and after 2 hours of wasted time  got 4 different responses, transferred to different departments and they partially credited the activation fees. I still have this $324 charge on my card and no one can confirm the original promise of $100 per line for leaving Sprint. I have been placed on hold for long periods of time and no one resolved any of my issues. On Saturday June 23rd, 2018 I spent an hour on the phone and was told I'd get a call back after she escalated the call, but it is now Tuesday June 26th and I have not had any response from AT&T. I am beyond livid because I am a few days shy of my 14 day return period and considering switching back to Sprint. Is there any department I can reach out to, in order to get my issues resolved? Or is my best option return the phones and go back to Sprint before my 14 days return period is up?