I understand that we have taken time from you and I'm sorry to ask you for more. I would like to assure you that we are working on this on priority.
This happens exactly to me. I placed an order and at the final review page before submission. I found out there is a mistake. My 10 years ago old address is used as the shipping address. Then I modify the shipping address to the correct one and submit the order. After I received the confirmation email. I found out the shipping address of the order is still the old wrong one. Then I keep talking to support by emails, chat and phone call for 5 days. They just kick and told me some specialist will talk to me. After 5 days trying's, they still don't change it. FedEx will delivery my package to the wrong place without signature. They will drop $2k package on the street! I'm not going to lose money but Dell will.
Cannot change shipping address!