Opened an account over the phone and it was closed by the time I went to the store the account was closed

On august 3rd I opened up a new account over the phone and recieved an email confirming the price and details. I was told to go the nearest Xfinity store to pick up the equipment but by the time I arrived and was helped, the person in the store told me that the account had been deactivated. I was told to open up a new account with her, in store, and to call customer service to just have the price changed to what it should have been initally. 

Customers service has not been helpful at all, they wont honor the original price/quote even though I have the email confirmation and the account number. They also have no explanation as to why it was closed. I need someone higher up to help me.