Ordering an Iphone 12

Hello,

Today i was trying to order iphone 12 Pro Max with unlimited sim contract, but i didnt realize that it was not Pro Max instead it was just the standard version, so i ended up ordering it. I have not gotten any secondary confirmation that my order has processed yet. I would like to cancel it before that happens and make a new order for the iphone 12 Pro Max. Can anyone help me in this regard or point me in the direction of what i can do to resolve this issue.