Device return issue/customer service issues

I went to upgrade my phone and the representative messed up and ordered me the same phone I have an added a new line instead of upgrading. I called right away and was told I can't cancel but I can refuse delivery with FedEx they came 2 days later I refused delivery it's been back at the warehouse for over a week now and it's still on my account my phone bill is now due soon and it's increased by almost $100 because of this phone and line on the account and I can't even upgrade my phone because my credit limit is to low now by $100 because of the phone and new account now the phone I wanted is on back order aswell on top of that I've been told different things by different representatives I was told over

a week ago 5 days it's been 5 days and nothing happened I was told ive been refunded I'll have the refund by the 30th which was yesterday and nothing I was put on hold for 40 minutes while a rep talked to the credit team and she said they were able to increase my limit so | can atleast get the phone I wanted and that she'll call me in a hour to order it once the limit increases and changes go through and that did not happen the limit is still the same and now talking to another representative and he says wait 5 to 7 days the same thing the other two reps said 5 to 7 days ago and nothing happened so what am I supposed to do?! Who do I contact to get this resolved ASAP? my money is up in the air the phone I wanted to upgrade to

is now on back order when it was originally a preorder at the beginning so this whole process has taken so long that the phone was on preorder then released then back ordered and on top of that my phone bill is $100 more due this month because of that phone and I refuse to pay it.