Exchange/New Order

Hello, I have been trying to do an exchange and was waiting on the approval and had to contact the live chat and my request had to be pushed out again because I had not heard anything back in the 2 business days that it had said it would take. I finally received an email back saying that they are unable to do an exchange because the style/sizes I need are low stock. So I was given two options, either to place a new order or select a different style. I would like to place a new order and was told to use a unique code that is valid for the next 48 hours for the shipping fee to be waived, but no code was given to me. I have tried reaching out on the live chat, even waiting over an hour as it said someone was joining but never did. I also emailed back saying I would like to place a new order, but no response back. I have no way of getting help in the time span I am given and am not sure what else I am supposed to do when I am not getting any responses back. My order number is #2350464NA.