AT&T Messed up my credit !

I’ve tried ordering a iPhone XS Max 6 times online with AT&T and my order would be canceled, I was told to go to the store but I was told at the store I went to they didn’t accept cash or a prepaid card after being told that I called costumer service and the guy I spoke to said I should order the phone again so after listening and agreeing to order the phone gain I was told I would have to pay a $500 dollar down payment and I was astonished because at 1st I was only required to pay sales tax ! After talking to a extremely rude costumer service lady she said that I should’ve never tried to order the phone so many times and I told her that the agents told me to keep on trying. I’m going to go to a store tomorrow would my payment go down to to paying sales tax which was 79.84